Deo Condominium Lawyers
9 lawyers · York Region
One of 300 law firms listed in Vaughan, and one of 160 handling Real Estate Law.
About Deo Condominium Lawyers
Deo Condominium Lawyers is a Vaughan, Ontario firm of eight lawyers who practice condominium law only. It was founded by Mario D. Deo, who was called to the Ontario Bar in 1987 and has taught condominium law to property managers at Humber College and Seneca College since 1993. The firm's work is limited to representing condominium corporations and their boards, spanning everyday governance and by-law questions through to litigation, Condominium Authority Tribunal cases, liens, insurance disputes, and Tarion warranty claims tied to new construction.
Mario Deo served as President of the Canadian Condominium Institute's Toronto Chapter from 2014 to 2015 and received the Association of Condominium Managers of Ontario's President's Award in 2006, and Deo has also been appointed to Tarion's Consumer Advisory Committee to advise on condominium issues. The rest of the team includes lawyers who worked as caseworkers with tenant legal clinics before joining the firm, a former insurance defence litigator, and associates who teach CMRAO-accredited courses and write for Condo Voice Magazine. The firm has been the partner sponsor of the annual Condo Conference since 2023.
Practice areas
Milestones & recognition
- Mario D. Deo founded the firm after being called to the Ontario Bar in 1987.
- Deo received the Association of Condominium Managers of Ontario's President's Award in 2006.
- Deo served as President of the Canadian Condominium Institute's Toronto Chapter from 2014 to 2015.
- Deo has taught condominium law to property managers at Humber College and Seneca College since 1993.
- Deo was appointed to Tarion's Consumer Advisory Committee to advise on condominium issues.
In the community
- The firm has been the partner sponsor of the annual Condo Conference since 2023, most recently in 2025.
- Firm lawyers Eric Plant, Lyndsey McNally, Maria Dimakas, and Joy Matthews appeared as guests on TVO's The Agenda with Steve Paikin to discuss whether condo boards still play a vital role as more condominiums rise up across Ontario.
- Firm lawyers sit on the Canadian Condominium Institute Toronto Chapter's board and committees, including its Legislative Committee and its Safety and Legislation Committee.
- Firm lawyers teach CMRAO-accredited courses for property management companies and instruct condominium law courses at Humber College and Seneca College.
- Firm lawyers have published articles on condominium law in Condo Voice Magazine and CM Magazine.
- One of the firm's lawyers founded Kai's Little Library, a community book-sharing initiative.
Good to know
Wheelchair accessibleLawyers 9
Amrit Sagoo
Lawyer
Real Estate Law
Antoni G. Casalinuovo
Lawyer
Real Estate LawCivil Litigation & Dispute Resolution
Francesco Deo
Lawyer
Real Estate LawCivil Litigation & Dispute Resolution
Maria Dimakas
Lawyer
Real Estate Law
Mario D. Deo
Team Principal
Real Estate Law
Michael D. Pascu
Lawyer
Real Estate Law
Negeen Naderi
Lawyer
Real Estate Law
Rohina Hashimi
Lawyer
Real Estate LawCivil Litigation & Dispute Resolution
Yulia Pesin
Lawyer
Real Estate LawCivil Litigation & Dispute Resolution
This firm’s lawyers at a glance
- Called to the bar
- 1987–2024 · median 14 years in practice 9 of 9 lawyers
- Law schools
- University of Ottawa (3), Osgoode Hall Law School (2), Queen's University, Queen's University Law School, University of Western Ontario, University of Windsor 9 of 9 lawyers
- Languages on the roster
- Persian/Farsi, Russian
Who handles what
The neighbourhood
The firm's office sits on Steeles Avenue West in Vaughan, just minutes from Highways 400 and 407. Because the practice is built entirely around condominium corporations rather than a single neighbourhood's clients, that highway access supports lawyers travelling to board meetings, mediations, and tribunal hearings away from the office.
Frequently asked questions
- What areas of law does Deo Condominium Lawyers handle?
- The firm practices condominium law exclusively. Its services cover governance, by-laws, litigation, liens, insurance, reserve funds, Tarion warranty and construction deficiency claims, and representation before the Condominium Authority Tribunal.
- Does Deo Condominium Lawyers represent individual condo owners or only condominium corporations?
- The firm's practice is built around representing condominium corporations and their boards, not individual unit owners.
- Can the firm help a condo board with a Condominium Authority Tribunal (CAT) case?
- Yes. CAT representation is listed among the firm's services, alongside the governance and human rights disputes that increasingly end up before the tribunal.
- Does the firm handle Tarion warranty and new-construction deficiency claims for condo corporations?
- Yes, Tarion warranty issues and construction deficiencies are listed among the firm's services.
- How big is Deo Condominium Lawyers and where is it located?
- The firm has eight lawyers working from a single office on Steeles Avenue West in Vaughan, Ontario, near Highways 400 and 407.
- Does Deo Condominium Lawyers advise on electric vehicle charging installations in condo buildings?
- Yes, EV charging is listed among the firm's condominium services.
Where to find them
3100 Steeles Ave. W., Suite 300, Vaughan, Ontario, Canada L4K 3R1 · 905-760-1800
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Wills, Estates & TrustsListing compiled from the firm’s public website in September 2026. Verify licence status in the Law Society of Ontario directory ↗