Petroleum Property Valuation and Advisory
Gain an Understanding of Market Drivers and Environmental Considerations that Impact Petroleum Assets
The petroleum industry is complex and ever-changing with many market drivers and environmental considerations that require in-depth evaluation. Our team of highly skilled and experienced valuers help you navigate and analyse this challenging market and enable you to make the most informed investment decisions. We dedicate ourselves to gathering the best insights and creating quality reports to support your next decision.

Our Coverage
We have a team of more than 500 local valuers providing coverage across 98% of Australia’s postcodes. Our experts have local knowledge in metropolitan to rural areas and experience with a wide range of petroleum assets.

Our Technology
Our technology enhances the valuation process for everyone involved with customisable, automated workflows and centralised systems to access, manage, and deliver your reports.

Our Process
We integrate innovation into every step of our process from ordering a valuation to receiving your final report. Our seamless valuation experience combines the human expertise of our valuers and the efficiency of our technology.
Services for the Petroleum Industry
Our Petroleum Expertise
Our Experts

Doug Shorten
Head of Department- Social Infrastructure

Duncan Cameron
Director - Specialised & Advisory

Gavin Lipplegoes
Director - Specialised & Advisory

Glenn Boyd
Director Specialised & Advisory
![Headshot of John O'Grady [C]](https://opteonsolutions.com/hubfs/Bundy%20Images/John%20OGrady.jpg)
John O'Grady [C]
Director - Specialised and Advisory

Joshua Fulton
Director - Specialised and Advisory

Matt Morton
Director - Regional Commercial & Agribusiness

Ray Codalonga
Director - Specialised & Advisory

Ty Winduss
Director - Commercial

Tim Heath
Associate Director

Hayden Mcleod
Senior Valuer

Ian Britton
Senior Certified Property Valuer

Ian O'Shea
Senior Valuer - Commercial Specialist

Kerri Ellis
Senior Commercial Valuer

Mark Baxter
Senior Valuer

Mark Youngman
Senior Valuer

William Sutherland
Senior Valuer
![Headshot of David Moore [C]](https://opteonsolutions.com/hubfs/Bundy%20Images/David%20Moore.jpg)
David Moore [C]
Valuer Specialised & Advisory

Eva Schmidt
Certified Practising Valuer

Ryan Webster
Valuer Specialised & Advisory

Bret Taylor
Managing Director

Nick Walls
Managing Partner

David McKenzie
Director

Greg Mason
Director - Specialised & Advisory

Stuart Prowse
Director

William Read
Director

Calvin Rogers
Director

Doug Shorten
Areas of Expertise
- Commercial and residential development valuations
- Trading properties (Going Concern Valuations)
- Social Infrastructure (Childcare/Medical)
- Mortgage requirements
- Institutional valuations
- Asset valuations for financial reporting
- Strategic investment property advice
- Pre-sale and pre-purchase advice
Industry Experience
In 2011, Doug became a Certified Property Valuer in Western Australia with five years prior commercial valuation experience in Auckland, New Zealand as a Valuer and associate member of the New Zealand Property Institute
Doug’s experience includes the preparation of Valuations and consultancy advice for residential and commercial asset classes ranging from englobo and urban infill development sites, existing and proposed residential developments, trading properties including childcare centres, service stations, caravan parks and licensed premises, large scale office and retail accommodation including shopping centres and a wide range of industrial properties.
Valuations have been completed for clients within the private, institutional and banking sector.
Formal Qualifications
- Associate Member of the Australian Property Institute (API Member No. 75639)
- Licensed Valuer in the State of Western Australia, License No. 44826
- Bachelor of Business – (Valuation and Property Management) completed at Massey University, New Zealand – 2006

Duncan Cameron
Areas of Expertise
- Commercial, retail, and industrial valuations
- Residential development project valuations (i.e., residential subdivisions, englobo land, built form developments)
- Specialised and trading properties (i.e., hotels, motels, taverns / licensed premises, lifestyle (retirement) villages, caravan parks, childcare centres, accommodation resorts, service stations etc.)
- Rental Determinations
- Compensation
- Expert Witness in property disputes in the District Court, Supreme Court, Federal Court, Family Law Court and State Administrative Tribunal
Industry Experience
Duncan joined Knight Frank in 1984, initially working in their Commercial Property Management Department before transferring to the Project Management Department and then finally to the Valuation Department, leading to professional licensing in 1988. In 1991 Duncan worked with the East Perth Redevelopment Authority as their property officer then moved in 1993 to Hooker Corporate’s (Perth) Valuation Department as Senior Valuer.
Duncan joined Opteon (Western Australia) (formerly Christie Whyte Moore) in 1994 as a Senior Valuer and was elevated to a Director of the firm in January 1999. During subsequent years Duncan has continuously remained as Commercial Department Director of Opteon’s Perth based practice, overseeing, and undertaking a wide variety of Specialised and Development Valuations throughout Perth and Western Australia.
Formal Qualifications
- Fellow of the Australian Property Institute (Admitted 1998) (API Member No: 64637)
- Associate Member of the Australian Property Institute (Admitted 1988)
- Certified Practising Valuer
- Licensed Valuer (Western Australia) No. 497
- Bachelor of Business (Valuation & Land Economy) – Curtin University WA
- Bachelor of Science (UWA)

Gavin Lipplegoes
Areas of Expertise
- Experienced in the provision of valuation services for a broad range of purposes, including Pre-Purchase/Sale advice, Mortgage Security, Expert Witness, Market Rental Assessments and Insurance Replacement
- Areas of specialisation include Cold Storage facilities, Commercial and Residential Developments, Real Estate Rent Rolls, Petrol Stations and Child Care Centres
- Extensive experience in the valuation of asset portfolios for Financial Reporting purposes, including Government (all levels), GBE, Not-For-Profit and Educational Asset property portfolios
Industry Experience
Gavin is a senior property professional with over 17-years of property experience in Tasmania. His expertise in the field was recognised in 2003 when he was awarded CPV. Gavin has extensive experience across Commercial and Residential property segments, including multi-lot developments. In 2019, Gavin was appointed Director – Specialist & Advisory (Commercial) and played a pivotal role in Valuer training and development in Real Estate Rent Roll Valuations in Victoria and Tasmania.
Formal Qualifications
- Graduate Diploma (Property)
- Associate of the Australian Property Institute
- Certified Practising Valuer (CPV)
- Bachelor of Business (Accounting)
- Certificate of Compliance with the Australian
- Property Institute Continuing Professional Development Program
- Fellow of the Financial Services Institute of Australasia
- Graduate Certificate in Commerce (Business Banking)

Glenn Boyd
Areas of Expertise
- Commercial Property Valuations (Office, Industrial, Retail Asset Classes etc.)
- Mortgage Security Valuations
- Service Stations, Car Washes & Fast-Food Outlets
- Medical Related premises
- Industrial and Commercial subdivisions
- Corporate Real Estate
- Rental Valuations and Determinations
Industry Experience
Glenn has 20 years’ industry experience and is employed as a valuer by Opteon as Director – Specialised & Advisory within the Commercial Department. He has previously held Valuation and Advisory Director roles in leading international and local commercial real estate agencies. Glenn has expertise in the valuation of commercial, industrial and retail property. He provides advice to major lending institutions, corporate and private clients for mortgage, financial reporting, acquisition, disposal and consulting purposes. Glenn has considerable experience in Rental Valuations and Determinations. Glenn joined Opteon in 2013.
Formal Qualifications
- Associate Member of the Australian Property Institute (API Member No. 62692)
- Member Royal Institute of Chartered Surveyors (MRICS)
- Bachelor of Business (Property) with Distinction, RMIT 1998
- Certified Practising Valuer (CPV)
- Certified Property Practitioner (CPP)
- API Accredited Specialist Retail Valuer
- Member of the API President and Small Business Commissioner (SBC) Panel of Determining Valuers
- Affiliate Member of The REIV
- Registered Valuer QLD & NSW
![Headshot of John O'Grady [C]](https://opteonsolutions.com/hubfs/Bundy%20Images/John%20OGrady.jpg)
John O'Grady [C]
Areas of Expertise
- Asset valuations for financial reporting and mortgage security purposes
- Central Business District office/retail and mixed use property valuation
- Commercial and Residential development projects
- Major land subdivision project valuations
- Compensation assessment valuations
- Valuation of accommodation hotels, motels and serviced apartment complexes
- Valuation of licensed premises and gaming premises
- Valuation of retirement villages, aged care facilities and private hospitals
- Strategic property investment advice
Industry Experience
John has 47 Years of experience as a practising property valuer and has held senior executive roles with Knight Frank Australia, CBRE and Savills prior to commencing with Opteon in 2012 as Head of Commercial Valuations. He provides wide ranging property advice supported by an unrivalled wealth of experience.
Formal Qualifications
- Associate Member of the Australian Property Institute
- Certificate of Real Estate Management & Valuation – RMIT 1972
- Licensed Real Estate Agent

Joshua Fulton
Areas of Expertise
- Commercial, industrial, office and retail property valuations
- Petroleum valuations
- Family Law valuations
- Asset valuations for financial reporting
- Asset valuation advice for various local Councils throughout Victoria
- Rental valuations
- Strategic property investment advice
- Mortgage and financial reporting valuations for the education sectors
Industry Experience
Joshua has over fifteen years of experience as a valuer and has been employed by Opteon throughout this period. In his Director role, he provides valuations of commercial and industrial properties throughout Melbourne and regional Victoria. Joshua is also a specialist in complex assets for financial reporting purposes having been involved in a number of large portfolio valuation contracts. He heads up Opteon’s specialist petroleum division, undertaking valuations throughout the state of Victoria and along the eastern seaboard. Joshua has completed the Asset Valuation for Financial Reporting Certificate Course and the Expert Witness Professional Certificate course, both ran by the Australian Property Institute, and has undertaken a number of valuations of varying asset types for Family Law purposes.
Formal Qualifications
- Associate Member of the Australian Property Institute (API Member No. 63369)
- Certified Practising Valuer
- Bachelor of Business (Property) – RMIT 2007
- Certificate IV in Real Estate (Agent’s license) – Swinburne 2001

Matt Morton
Areas of Expertise
- Industrial property valuations
- Commercial property valuations
- Development feasibility
- Rental valuations
- Residential valuations
- Asset valuations for financial reporting purposes
- Government valuations
Industry Experience
Matthew has more than 15 years’ valuation experience in North Queensland over a broad spectrum of commercial and residential properties.
This experience includes valuation and property advice in both commercial and residential matters pertaining to resumptions, insurance valuations, rating appeals, Family, Federal and Supreme Court Matters, rental determinations, residential development feasibility and high value industrial facilities.
Matthew’s current role also involves training of cadet valuers, quotations, authorisation and distribution of valuation assignments to the other valuers and management support for the whole Queensland commercial team.
Formal Qualifications
- Certified Practising Valuer (2697)
- Associate Member of the Australian Property Institute (3172)
- Bachelor of Business (Property Studies) – University of Queensland

Ray Codalonga
Areas of Expertise
- Asset valuations for financial reporting
- Commercial / Industrial
- Englobo / Subdivisional Land
- Rural Lifestyle
- Trading Properties
- Mortgage Requirements
- Pre-sale / pre-purchase advice
- Rental valuations
- Strategic investment property advice
Industry Experience
Ray commenced his property career with Baillieu Knight Frank in 1993, initially as a trainee commercial property manager before progressing on to being the inaugural assistant property manager at Market City, Canning Vale and then managing a portfolio of commercial, industrial and retail properties.
In August 1999, Ray commenced as a trainee valuer, still with Knight Frank and became a Licensed Property Valuer in 2001.
From 2003 to the present, Ray has been employed at Opteon, (predecessor’s Quantia and Valuation Partners WA Pty Ltd), predominately working in the fields of commercial, retail, industrial, residential subdivision, rural and specialised properties. Ray has also undertaken rental determination work.
Formal Qualifications
- Associate Member of the Australian Property Institute (2001)
- Licensed Valuer in the State of Western Australia Licence No.44028
- Bachelor of Business – Curtin University (1989)

Ty Winduss
Areas of Expertise
- Commercial office, retail and industrial valuations
- Self-storage, childcare and service station valuations
- Commercial development consultation and feasibility studies
- Asset valuations for financial reporting in accordance with Australian Accounting Standards
- Market rental assessments and arbitrations
- Property consultancy including analysis of procurement and disposal options
Industry Experience
Ty has 10 years’ experience working within the property valuation industry and became an associate member of the Australian Property Institute (CPV) mid 2012.
Prior to retuning to Tasmania in 2015, Ty spent several years in Melbourne, most recently employed with Jones Lang LaSalle, primarily undertaking valuations of institutional grade CBD and suburban commercial, retail and industrial assets. Additional roles included rental reviews, development feasibilities and various valuation requirements for larger Tasmanian assets.
Ty is now based in Hobart and operates within the commercial sector throughout Tasmania, providing a broad range of consultancy and valuation expertise for clients including the major banks, institutional and private investors.
Formal Qualifications
- Australian Property Institute Specialist Retail Valuers Course 2014
- Certificate of Compliance with the Australian Property Institute CPD Program 2019
- Certificate of Accreditation – Development Feasibility v5, Estate Master
- Certified Practising Valuer 2012
- Associate of the Australian Property Institute 2012
- Bachelor of Applied Science (Valuations) (with Honours 1st Class), Royal Melbourne Institute of Technology

Tim Heath
Areas of Expertise
- Commercial and residential valuations
- Mortgage requirements
- Asset valuations for financial reporting
- Strategic investment property advice
- Resumption of freehold land
- Pre-sale and pre-purchase advice
- Family law
Industry Experience
In 2021, Tim was appointed an Associate Director in the Commercial Division of Opteon (Western Australia). Tim has extensive experience valuing a broad range of complex asset types including large scale industrial facilities, englobo development sites, and general commercial/retail, together with more specialised asset types such as childcare centres, service stations and self-storage facilities.
Formal Qualifications
- Bachelor of Commerce (Property) at Curtin University of Technology in 2004
- Associate Member of the Australian Property Institute (API Member No. 65172)
- Licensed Valuer in the State of Western Australia, License No 44247
- Certified Practising Valuer

Hayden Mcleod
Areas of Expertise
- Residential Valuations
- Commercial, Retail & Industrial Valuations
- Rural Valuations
- Developments Valuations & Consultancy
- Going Concern Valuations
- Depreciations Assessments
- Insurance Valuations
- Holiday Apartments
- Rental Valuations
- Port and other infrastructure ground leases
Industry Experience
Hayden has extensive property valuation and consultancy experience having started within the industry in late 2005. Hayden relocated to Broome in the latter part of 2012 to take up a senior valuation role with Opteon (North West WA), having previously worked in Perth specialising in a range of commercial, retail and industrial property valuation fields. Hayden has an intimate knowledge of the Kimberley and the various property markets this region encompasses. Hayden was a director of Opteon (North West WA) prior to integration in March 2017.
Formal Qualifications
- Certified Practising Valuer (CPV)
- Associate Member of the Australian Property Institute
- Bachelor of Commerce (Property & Commercial Law)

Ian Britton
Areas of Expertise
- Specialist hotel and motel Valuer
- Other ‘going concern’ valuations i.e. service stations, car washes, childcare centres, caravan parks, etc.
- Business Valuations (i.e. rent rolls and other specialised businesses)
- Court related matters
- Land purchase negotiations on behalf of Mining Companies and Statutory Authorities
- Specialised larger rural properties and enterprises
- Retail & Commercial Rental Assessments
- Inglobo development / subdivision parcels
- Valuations under the Land Acquisition (Just Terms Compensation) Act 1991
Industry Experience
Ian is a Senior Valuer with Opteon Solutions and has been employed in the Orange NSW office for the past 16 years, specialising in ‘going concern’ valuations together with complex commercial and rural property valuations.
Formal Qualifications
- Certified Practising Valuer
- Fellow of the Australian Property Institute FAPI
- Bachelor of Applied Science (Agriculture)graduating with Merit (University of Western Sydney)
- Advance Diploma of Property (Valuation) graduating with Distinction (OTEN)

Ian O'Shea
Areas of Expertise
- Hospitality valuations including Going Concerns and Leasehold interests
- Residential and Commercial development consultation
- Family law and single expert
- Asset valuations for financial reporting in accordance with Australian Accounting Standards
- Central business district office valuations
- Commercial office, retail and industrial valuations
- Rental assessments and arbitrations
- Property consultancy including analysis of procurement and disposal options
Industry Experience
Ian joined Opteon in 2012 from the Banking and Finance industry and has worked across a broad range of property types since this time. Ian is considered an expert in commercial property and provides advice on a large range of assets within Tasmania.
Formal Qualifications
- Associate Member of the Australian Property Institute (API Member No. 77195)
- Certified Practising Valuer
- Certificate of Compliance with the Australian Property Institute Continuing Professional Development Program
- Bachelor of Business
- Graduate Diploma in Property Valuations

Kerri Ellis
Areas of Expertise
- Commercial valuations of industrial, office and retail properties
- Specialist experience with medical offices
- Specialist experience with going concern properties such as motels, caravan and cabin parks, animal accommodation, storage facilities and service stations
- Valuations for a range of purposes including mortgage security, property taxation, due diligence, financial reporting and compulsory acquisitions
Industry Experience
Kerri has over 12 years’ experience in the Property Valuation industry, specialising in commercial property valuations. With over 4 years’ experience as a Certified Practising Valuer, she has undertaken valuations for a diverse range of specialised and commercial assets across South East Queensland and Northern New South Wales. Kerri regularly provides reports for mortgage security, due diligence and financial reporting purposes.
Formal Qualifications
- Associate Member of the Australian Property Institute (API No. 101506)
- Certified Practising Valuer
- QLD Registered Valuer (QVRB No. 4013)
- Bachelor of Property – Central Queensland University (2017)

Mark Baxter
Areas of Expertise
- Banking and Finance Valuations
- Valuations of Specialised Commercial Assets including accommodation assets (freehold interests and going concern)
- Valuations for Financial Reporting Purposes in accordance with AASB 13 Fair Value Measurement
- Matrimonial Separation and Family Court Valuations
- Taxation (Stamp Duty, Capital Gains Tax and GST)
- Replacement Insurance Assessments
- Compulsory Acquisition
- Residential Development Valuations/Feasibility Assessments
Industry Experience
Mark has more than 25 years of property industry experience, including 19 years as a registered valuer. His experience includes valuations of both residential assets (including residential development projects and prestige dwellings) and a wide range of commercial assets throughout Townsville and the wider North Queensland area. He undertakes valuations for numerous lenders for mortgage security purposes. He also has extensive experience in undertaking valuations for Local, State and Federal Government clients and other major National clients such as Defence Housing Australia and Australia Post.
Formal Qualifications
- Certified Practising Valuer
- QLD Registered Valuer (QVRB No: 2528)
- Associate Member of the Australian Property Institute (API Member No. 66374)
- Bachelor of Business (Property Studies)

Mark Youngman
Areas of Expertise
- Retail, industrial and office complexes
- Superannuation rentals and valuations
- Hospitality properties including gaming hotels, motels and tourist parks
- Leasehold business valuations
- Aquaculture and vineyards
- Asset/financial reporting
- Commercial rent reviews
- Pre purchase and presale commercial valuation and consultancy
Industry Experience
With a background in auditing, general accounting and management consulting, Mark has more than 10 years of experience in general valuation practice with all property types. Mark is considered a commercial and hospitality property expert and provides a large number of valuations of properties within Melbourne. As a result of Marks experience in commercial and hospitality valuations he has valued a range of property types including suburban and country hotels/motels, tourist parks, bottle shops, gaming and international hotel properties, reception centres, resorts, commercial vineyards, nursing homes, hospitals and also a period with the retail sales department.
Formal Qualifications
- Bachelor of Business in Accounting, UTAS, 1980.
- Associate Diploma in Valuation, 1987 with Distinction, RMIT (Melbourne)
- Graduate Diploma in Applied Finance and Investment 1996
- Chartered Accountant, 1984 to 2018

William Sutherland
Areas of Expertise
- General Commercial Valuations (all asset classes including retail, industrial and offices)
- Development Project Valuations (residential englobo land and built form developments)
- Specialised Property Valuations (hotels, taverns, night clubs, small bars, caravan parks, motels, childcare centres, resorts, service stations etc.)
- Expert Witness Valuations
- Property Consultancy
Industry Experience
William has practised as a property valuer since June 2000. Prior to that, he practised as a quantity surveyor. He has extensive experience in the valuation of a range of property types, including vacant sites suitable for both pure residential built-form and mixed-use built-form development, and is a specialist in hotel and leisure property valuations.
He has undertaken valuations of various interests in real estate, including fee simple freehold interests, leasehold interests, and freehold going concern walk in, walk out interests. William has also undertaken consulting work for a range of purposes including government agency and corporate internal decision-making purposes. This consulting work has included cost/benefit analysis and other decision-making analyses for both tenants and landlords. Further, William has undertaken scenario analyses for optimal investment in office and industrial property, as well as hotel development feasibility modelling.
In addition, William has undertaken market rental valuations for determination purposes, and has been involved in negotiation and resolution of market rental disputes, both via the determination process and outside of the determination process, on behalf of clients.
Formal Qualifications
- Bachelor of Science (Quantity Surveying)
- Bachelor of Commerce (Management, Finance & Real Estate) (Hons)
- Certified Practising Valuer
- Associate Member of the Australian Property Institute (Member No. 65314)
- Licensed Valuer No. 44413 for the State of Western Australia
- Professional Member of the Royal Institution of Chartered Surveyors (MRICS) – Chartered Valuation Surveyor & RICS Registered Valuer
![Headshot of David Moore [C]](https://opteonsolutions.com/hubfs/Bundy%20Images/David%20Moore.jpg)
David Moore [C]
Areas of Expertise
- Valuations and consultancy for major assets including industrial, major shopping centres, Perth CBD office buildings, general commercial, specialised commercial and residential
- Expert Witness in property disputes
- Oil, gas and mining sector
- Complex capital and rental valuation and consultancy tasks associated with the oil and gas, and mining sector
Industry Experience
In 1990 David was a founding Director of Christie Whyte Moore. In subsequent years the business grew to become Perth’s pre-eminent professional services company.
In July 2011, property valuation firms across Australia collaborated to form Opteon Property Group. David became Director of Opteon (Western Australia).
David was President of Australian Property Institute Western Australian Division from 2008 to 2009, and National President from 2009 to 2010; Member of the Department of Planning and Infrastructure Board of Valuers from 2006 to 2011 and Senior Sessional Member, State Administrative Tribunal of Western Australia from 2010 to Present.
Formal Qualifications
- Certified Practising Valuer
- Licensed Valuer in the State of Western Australia
- Fellow Australian Property Institute

Eva Schmidt
Areas of Expertise
- Residential property valuations
- Commercial Property valuations
- Industrial Property valuations
- Rural valuations
- Valuations for mortgage security purposes
- Valuations for compulsory acquisition
- Valuations for property taxation, legislation and policy purposes
- Valuations for pre-purchase / pre-sale advice purposes
- Asset valuations for financial reporting purposes
- Rental valuations
Industry Experience
Eva has worked with Opteon for over 18 years based in the Maryborough office whilst working throughout the Wide Bay region. Eva has a broad knowledge base and works in residential, commercial, industrial and rural property valuations. Eva regularly provides reports to property portfolio owners for commercial property, including mortgage security, acquisition and disposal requirements, compulsory acquisition and rental assessment amongst others.
Formal Qualifications
- Certified Practising Valuer
- Associate Member of the Australian Property Institute (API Member No. 66563)
- QLD Registered Valuer (QVRB No. 2771)
- Bachelor of Business (Property Studies) 2003 University of Queensland

Bret Taylor
Areas of Expertise
- Asset Valuations for Financial Reporting
- Central Business District – Office/Retail
- Commercial Office/Retail, Industrial
- Compensation Assessments
- Depreciation Schedules
- Lessor/Lessee’s interests
- Rental Valuations
- Residential/Prestige Residential
- Rural Land
- Rural Lifestyle/Agribusiness
- Broad acre Farming & Irrigated Land
- Sub Divisional Land
- Hotels, Motels & Caravan Parks
- Multi-Unit Development and Feasibility Studies
Industry Experience
Formal Qualifications
- Associate Member of the Australian Property Institute
- Certified Practising Valuer QLD 1404

Nick Walls
Areas of Expertise
- Commercial and Industrial valuations
- Agribusiness valuations
- Going concern valuations of trading properties
- Mortgage requirements
- Valuation for compensation purposes
- Asset valuations for financial reporting
- Family Law
- Rental valuations
Industry Experience
Nick began his valuation career valuing residential property in Perth before moving to New Zealand to develop skills in commercial and industrial valuations. On moving back to Perth, Nick worked with a small firm specialising in valuations for compensation purposes. In 2010, Nick moved to Albany, having a very active involvement in valuation of a broad range of property throughout the Great Southern Region including trading properties in the tourist and Hospitality sectors, Residential Development Land and Agribusiness. In 2017 Nick became the Managing Partner of Opteon Albany and Great Southern WA. Nick maintains local client relationships based on mutual ethics and integrity.
Formal Qualifications
- Curtin University of Technology – Bachelor of Commerce (2004)
- Associate Member of the Australian Property Institute (API Member No. 65182)
- Licensed Valuer in the State of Western Australia, License No. 44388

David McKenzie
Areas of Expertise
- Expert witness in respect to the Timbercorp Almonds matter, involving water valuations of hundreds of millions of dollars (SCI 2009 – 10699)
- Recent valuation of 25 Gl of unregulated flows in Victoria for the Department of Treasury & Finance
- Irrigated holdings – dairy, horticulture, and cropping, in New South Wales and Victoria over 30 years, for a wide range of clients and purposes
Industry Experience
Qualified since 1991, David trained with the Victorian Valuer General, and has practiced in northern Victoria for over 30 years. He was instrumental in the inception, design and delivery of the API Specialist Water Valuer Accreditation. He has addressed several national and international conferences in relation to interpretation of water markets.
An agriculture supply-chain valuation specialist, David has particular expertise in relation to irrigation properties including dairies, orchards, vineyards, and intensive animal enterprises. He has valued major cool storage complexes, fruit packing and grading developments, glasshouses and multiple specialised going concern enterprises. He is an experienced expert witness, having given evidence in major litigation matters, in several jurisdictions, including the Victorian Supreme Court.
David has a deep understanding of rural economies and the water sector. He currently serves as a Director of Goulburn Murray Water, and has served several terms as Chair of North East Water, and as a Director of Goulburn Valley Water. He is co-Chair of the influential Water Policy think tank the GMID Water Leadership Forum and served on several State & Federal government regional development and water taskforces, panels and committees.
Formal Qualifications
- B. Bus (Property) - RMIT University
- Associate Member of the Australian Property Institute (API Member No. 62435)
- Accredited Specialist Water Valuer
- Accredited Specialist Retail Valuer
- Certified Practising Valuer
- Award for Meritorious Service to the Australian Property Institute, 2015

Greg Mason
Areas of Expertise
- Valuation of industrial, commercial and tourism property including motels and caravan parks
- Insurance valuations
- Asset, plant, machinery, equipment, and infrastructure valuations
- Asset valuations for government departments including financial reporting, componentisation analysis and condition scores of all assets
- Expert witness of plant, machinery, and equipment for family law purposes
- Asset register development and stock take reporting
- Make good liability assessment reports
Industry Experience
Greg has been with Opteon for over nine years and undertakes valuations of agribusiness, commercial, industrial and tourism properties on the NSW South Coast and in the Snowy Monaro region. Additionally, Greg assists and undertakes plant, machinery, and equipment valuations for the Opteon group nationally. He is well experienced in the property industry having worked in the industry for over 20 years with 16 years of those as a valuer across NSW including experience with a broad range of infrastructure, asset, plant, equipment and machinery valuations across Australia and Oceania regions.
Greg has acted as an Expert Witness in numerous family law matters and is the current Chair of the API far NSW South Coast Valuers Group.
Formal Qualifications
- Associate Member of the Australian Property Institute (API Member No. 69938) (2008)
- Advanced Diploma Property Valuation – Sydney Institute of TAFE (2006)
- Graduate Diploma Property Investment & Development – UWS (2008)
- Certified Practising Valuer
- Certified Practising Valuer (Plant & Machinery)

Stuart Prowse
Industry Experience
Stuart has more than 30 years’ experience in undertaking property valuation in Australia. With a background and professional education in Agriculture, Stuart specialises in valuations for broadacre, dryland and irrigated cropping and grazing properties, diverse horticultural enterprises as well as Agriculture Processing and Storage Facilities.
In addition to valuation of Agricultural land, Stuart has a strong background in providing advice on a broad range of Commercial and Industrial property including Going
Concern property in the hospitality sector. As a Senior Valuer, Stuart provides statutory valuation advice, this includes the provision of rating and taxing valuations, objection briefing services and parallel valuations for NSW Government.
Formal Qualifications
- Vice President NSW Division Australian Property Institute 2003-2006
- Fellow of Australian Property Institute (API Member No. 68127)
- Certified Practising Valuer
- Registered Valuer NSW No. 2702
- Registered Valuer QLD No. 1894
- Member of Australasian Association of Agriculture Consultants (CPAg.)
- Associate Diploma in Farm Management - University of New England
- Bachelor of Business (Real Property Valuation and Administration) - Queensland Agriculture College

William Read
Areas of Expertise
- Valuations of Commercial, Industrial, Rural, Residential, Subdivision and Land Development property
- Valuations for mortgage security
- Valuations for pre-sale and pre-purchase advice
- Valuations for family law purposes
- Asset valuations for financial reporting purposes
- Compensation valuations
- Valuation of water assets
Industry Experience
William has been working throughout North-East Victoria and Southern NSW for the last eighteen years, providing valuation advice across a broad number of property types and for a broad range of purposes. Having grown up in the area, William is very familiar with the region and has a strong understanding of the local market dynamics. William predominantly provides valuations of commercial, industrial, rural, residential, subdivision and land development property.
Formal Qualifications
- Associate Member of the Australian Property Institute (API Member No. 62954)
- Certified Practising Valuer
- API Accredited Specialist Water Valuer
- Graduate Diploma in Valuations (RMIT) 2003
- Bachelor of Economics (La Trobe University) 2000

Calvin Rogers
Areas of Expertise
- Management of Government Projects
- Residential, Commercial, Industrial, Tourism & Special Purpose Valuations
- Rental Determination Matters
- Litigation Valuation acting as an Expert Witness
- Diversified Property Services
- Portfolio Projects
Industry Experience
Calvin has worked in the property industry for the past 15+ years throughout Australia and New Zealand in both metropolitan and regional areas.
His experience includes valuation, consultancy, business development and management. Calvin specialises in government projects, specialised commercial and diversified property services.
Formal Qualifications
- Bachelor of Commerce – University of Sydney (2001)
- Masters of Property Development – UTS (2005)
- Registered Real Estate Valuer No 23145
- Advance Diploma of Property Valuation (2010)
- Member of API (Associate & CPV)
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