A DiamondCorp development in the Greater Toronto Area

DiamondCorp

DiamondCorp was founded in Toronto in 2008 by Stephen Diamond, who spent over thirty years in municipal law before becoming a developer. It specialises in unlocking under-utilised sites through complex planning work, building on a family legacy: his father Ephraim Diamond co-founded Cadillac Development Corporation, now Cadillac Fairview, in 1953.

DiamondCorp at a glance
Building since2008
Head officeToronto, Ontario
ScaleBuilt on a family development legacy going back to 1953
BuildsMixed-use communities, Complex urban sites, Residential, Retail and commercial
Official sitediamondcorp.ca

Who is DiamondCorp?

DiamondCorp is a Toronto developer founded in 2008 by Stephen Diamond. It was built on the development legacy established by his father, the late Ephraim Diamond, almost seventy years earlier.

That legacy is specific and significant. Ephraim Diamond co-founded Cadillac Development Corporation in 1953, the company that became Cadillac Fairview, and served as its Chairman and CEO until 1979.

Leadership is now passing again, with Ty Diamond and Madison Isaacman guiding the next generation.

Why does a municipal lawyer make a different kind of developer?

Stephen Diamond spent over thirty years in municipal law, working with communities to rezone properties and determine their best future use, before founding DiamondCorp.

That is the opposite of the usual path. Most developers learn planning by running into it. DiamondCorp was founded by someone who already understood the approvals system, the politics around it and how community consultation actually works.

It shows in the company’s stated niche: recognising the potential of under-utilised sites and applying practical solutions to planning policy, in partnership with councillors, municipal staff and community groups.

What does DiamondCorp build?

Residential, retail and commercial within mixed-use communities, generally on sites that were complicated enough that others passed on them.

The company positions itself as a creative developer with real-world solutions to complex challenges, working with both private and public sector partners.

What does the complex-sites focus mean for a buyer?

Two things worth weighing.

On the upside, under-utilised sites are usually well located. They are vacant or underbuilt because of a planning problem, not because nobody wants to be there. Solving the problem tends to unlock genuinely good locations.

On the downside, complex sites take longer and carry more approval risk than a straightforward parcel. Ask where your project actually sits in the approvals process, because a project that is still being rezoned is at a different stage from one with a building permit.

What should a buyer check before buying from DiamondCorp?

Ask about approvals status directly: is the zoning in place, is site plan approval granted, is the building permit issued. On a company that specialises in difficult sites, this is the single most important question.

Ask who the partners are on your project, since DiamondCorp frequently works with private and public sector organisations, and the partner may handle construction or customer care.

Then the usual: deposit schedule, maintenance fee estimate, what is standard rather than an upgrade, and the occupancy and registration timeline.

How does DiamondCorp compare with an older builder?

The company itself is young, founded in 2008, but the experience behind it is not. Stephen Diamond brought thirty years of municipal law, and the family development history runs back to 1953.

What that means in practice is that DiamondCorp is strong precisely where new developers are usually weak, which is planning and approvals, and it has less of the long completed-building record that an older builder can show you.

So weight the questions accordingly. Ask about approvals confidently, and ask about completed and registered buildings carefully.

Common questions about DiamondCorp

When was DiamondCorp founded?
2008, by Stephen Diamond.
What is DiamondCorp's connection to Cadillac Fairview?
Founder Stephen Diamond's father, Ephraim Diamond, co-founded Cadillac Development Corporation, which became Cadillac Fairview, in 1953 and was its Chairman and CEO until 1979.
What kind of sites does DiamondCorp develop?
Under-utilised sites requiring complex planning work, unlocked by working with councillors, municipal staff and community groups.
Who leads DiamondCorp now?
Stephen Diamond founded it, and Ty Diamond and Madison Isaacman are guiding the next generation of leadership.

Compiled from DiamondCorp’s own published material at diamondcorp.ca and public records. We are not affiliated with DiamondCorp. Last checked against source on .

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