About DiamondCorp

A family legacy. A shared commitment to the future of our communities.

DiamondCorp development within the Toronto skyline
Developing residential and mixed-use communities across the Greater Toronto Area.

Building on a Legacy

Founded in 2008 by Stephen Diamond, DiamondCorp was built on the legacy of development excellence established by his father, the late Ephraim Diamond, almost 70 years ago. Committed to the future growth of the Greater Toronto Area, DiamondCorp brings forward a history of dedication and experience to develop innovative, high-quality, award-winning communities.

We recognize the potential of under-utilized sites and apply practical solutions to planning policies and objectives.

By partnering with private and public sector organizations and working with councillors, municipal staff, and community groups, DiamondCorp has built a reputation as a creative developer with real-world solutions to complex challenges.

Stephen Diamond with his late father, Ephraim Diamond
Stephen and his late father, Ephraim Diamond.

A long-term view.
A collaborative approach.

Every site is part of a neighbourhood. Bringing its potential to life means thinking about the residential, retail and commercial experiences that come together within a community.

Integrity, collaboration and innovation guide our work. We bring together planning and design expertise, working with partners, municipal staff and community groups to find practical solutions to complex sites.

Explore our communities

A legacy carried forward

Meet the team
Ephraim Diamond

Ephraim Diamond

Co-founded Cadillac Development Corporation (now Cadillac Fairview) in 1953 and served as Chairman and CEO until 1979.

Stephen Diamond

Stephen Diamond

Founded DiamondCorp in 2008; over 30 years in municipal law, working with communities to rezone and develop the best uses for future properties.

Ty Diamond and Madison Isaacman

Ty Diamond & Madison Isaacman

DiamondCorp's next generation of leadership is guiding the team forward with fresh vision and renewed purpose.

Meet TyMeet Madison

Recognition across our communities

From project identity to community planning, recognition of the work and the people behind it.

Q Tower overlooking Toronto’s waterfront

Q Tower

2025 · BILD AWARDS

Best Project Branding & Identity (highrise), Best Experiential Marketing Campaign, Best Organic Social Media Campaign

View Q Tower recognition
Brightwater on the Port Credit waterfront

Brightwater

2020 · BILD AWARD

Best New Community Planned

2020 · CANADIAN INSTITUTE OF PLANNERS

Award of Merit for Healthy Communities

View Brightwater recognition
Rendering of the atrium at The Well

Whitecastle
New Urban Funds

DiamondCorp is the manager of the five Whitecastle New Urban Private Equity Real Estate Funds, which represent approximately $1 billion of committed equity.

Contact us

Diamond Kilmer Developments

A partnership between DiamondCorp & Kilmer Group to deliver urban communities.

Visit Diamond Kilmer
Reunion Crossing community