About Altwerger Law Professional Corporation

Altwerger Law Professional Corporation is a small law firm based in Keswick, Ontario, a community within the Town of Georgina on the shore of Lake Simcoe. The firm operates out of an office at 187 Simcoe Avenue and keeps a separate phone line for clients calling from Toronto.

The firm's practice is organized around three areas: real estate (purchases, sales, refinances and leases), corporate and business law (incorporations, share purchases, bulk sales, and shareholder and partnership agreements), and estate planning (wills, powers of attorney and the administration of estates). It's a compact practice run by two lawyers, Stephen Altwerger, Q.C., and Mark Altwerger, who work across all three areas rather than splitting into separate departments.

Milestones & recognition

  • One of the firm's two lawyers, Stephen Altwerger, holds the designation of Queen's Counsel (Q.C.).

In the community

  • The firm is listed as a member of the Georgina Chamber of Commerce, which represents businesses in the Town of Georgina.

Good to know

A person using a wheelchairWheelchair accessible

The neighbourhood

Keswick sits on Lake Simcoe's Cook's Bay, about 72 kilometres north of Toronto, inside the Town of Georgina. It was mostly cottage country for much of the twentieth century before growing quickly from the late 1980s onward, and the extension of Highway 404 has kept that growth going by making the commute to Newmarket and Toronto easier. That kind of steady household turnover means a lot of home purchases, sales and refinances, which lines up with the real estate work the firm does out of its Simcoe Avenue office.

Frequently asked questions

Can Altwerger Law help me buy or sell a home in Keswick or Georgina?
Yes. The firm's real estate practice covers purchases, sales, refinances and leases.
Does the firm set up corporations or draft shareholder agreements?
Yes. Its corporate and business law work includes incorporations, share purchases, bulk sales, and shareholder and partnership agreements.
Can Altwerger Law prepare my will and power of attorney?
Yes. The firm's estate planning work covers wills, powers of attorney and the administration of estates.
How many lawyers work at the firm?
Two: Stephen Altwerger, Q.C., and Mark Altwerger.
I live or work in Toronto. Can I still reach the firm easily?
Yes. In addition to its Keswick office number, the firm keeps a separate phone line for Toronto callers.
Where is the office located?
At 187 Simcoe Avenue in Keswick, Ontario, within the Town of Georgina.

Where to find them

187 Simcoe Ave, Keswick, ON · 905-476-2555

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Listing compiled from the firm’s public website in September 2026. Verify licence status in the Law Society of Ontario directory ↗