GDM Property is a privately-owned property development company with nearly 30 years of expertise in land subdivision, spanning from site acquisition through to the sale of completed product.
With a comprehensive background in Property Management, Housing, Investments, and Consultancy, GDM Property has established a strong reputation for successfully developing projects in emerging markets and consistently delivering high-quality results.
Driven by a commitment to excellence, integrity, and a robust work ethic, GDM Property fosters long-term, mutually beneficial partnerships, ensuring sustained growth and profitability.
Geoff McWilliam
PRINCIPAL
GDM Property is led by Geoff McWilliam, a seasoned property developer with nearly 30 years of experience in land subdivision and development management.
Geoff began his career as an accountant at Ernst & Young before transitioning to his family’s development company. Over the years, he has played an integral role in the development of more than 10,000 lots and the management of master-planned communities, encompassing both residential and commercial elements, for prominent public and private companies such as Citimark, Stockland, Lensworth, Ray Group and Delfin Lend Lease.
For over a decade, Geoff partnered with Citimark, leading the expansion and management of planning, marketing, development, and sales teams for new residential subdivisions and master-planned projects. His leadership was also pivotal in the development of North Lakes, a 1,000-hectare, award-winning master-planned community in Brisbane. Other significant projects Geoff has led include Glenmore Park in Western Sydney and Kawana Waters on the Sunshine Coast, Queensland.
Geoff holds a Bachelor of Commerce from the University of Queensland and a Master of Built Environment from Queensland University of Technology. He is an active member of the Property Council of Australia and the Urban Development Institute of Australia (UDIA) and currently serves on the UDIA Logan Branch Committee.
Now, as the principal of GDM Property, Geoff focuses on delivering a diverse portfolio of residential subdivisions, housing and retirement village investments. Over the past six years, he has successfully developed eight projects, ranging from 34 to 185 lots, all within budget and on schedule. Looking ahead, Geoff has a pipeline of projects valued at over $150 million. Throughout his career, he has built strong relationships with land owners, consultants, contractors and local councils, ensuring the success and sustainability of his developments.
Jason Selling
SALES & OPERATIONS MANAGER
Jason Selling is our Sales & Operations Manager, responsible for bringing new residential developments to market in collaboration with our valued sales and builder networks, as well as overseeing the sales process from inception to completion. Since joining GDM Property in 2020, Jason has successfully managed the sale of 230 residential lots across six completed and currently trading developments across South East Queensland. He plays a key role in the day-to-day operations of the company, providing vital support to Geoff across the many facets of property development.
Before joining GDM Property, Jason was with Citimark Properties, where he spent over a decade in various roles within the Sales & Marketing team. During this time, he gained extensive experience across residential land, townhouse, and medium to high-rise apartment developments, equipping him with a thorough understanding of diverse product types and market cycles.
Jason holds a Bachelor of Business from the Auckland University of Technology and is a member of UDIA Queensland.
Henry McConnel
ACQUISITION MANAGER
Henry McConnel joined GDM Property in the beginning of 2025 as our Acquisition Manager. With over a decade in the property industry, Henry has held prominent positions with Colliers International and has also led the Queensland acquisitions arm for private development companies, including McAndrew Group and, most recently, Melbourne-based developer ID_LAND.
Over the past three years, Henry has played a pivotal role in lobbying, negotiating and acquiring over $200 million in residential subdivisions across South East Queensland.
Henry holds a Bachelor of Property Economics & Finance from the Queensland University of Technology.