Do you mean “best” for commercial buildings, multi‑family rentals, or condo/strata (HOA) management? In Canada the market is segmented, so below I list top, widely‑used firms by property type and why they’re commonly recommended — with sources you can check.

National / large-scale (commercial + institutional)

• CBRE — Global leader in commercial property and portfolio management, strong in office, industrial and investor/portfolio solutions across Canada. (CBRE.ca)
• Colliers — Major full‑service commercial real‑estate firm with national property management and outsourcing capabilities. Good for owners needing integrated advisory + operations. (wsj.com)
• Cushman & Wakefield (Canada) — Large commercial property management and facilities services provider with national coverage and institutional clients. (See their Canada property-management services pages.) (CBRE.ca)

Residential / condominium / multi‑family specialists

• FirstService Residential — One of Canada’s largest residential/condo management firms; widely used for condominium corporations and multi‑family rentals. Strong presence in Ontario and other provinces. (en.wikipedia.org)
• Minto (Minto Group) — Prominent for multi‑family development and property management in several provinces (owner‑operator model — good if you want integrated development + management). (en.wikipedia.org)

Institutional / asset managers with property operations

• QuadReal / Brookfield (operations brands) — Large institutional owners/managers that operate extensive commercial portfolios and partner with third‑party operators for large property portfolios. Useful for investors or large landlords. (CBRE.ca)

Regional and specialty players (when local knowledge matters)

• Local/regional firms — Many provinces/cities have well‑regarded boutique managers (e.g., Toronto, Vancouver, Calgary firms) that can outperform national firms for smaller portfolios or strata/condo boards because of local expertise and hands‑on service. (If you tell me province/city and property type I can list top local options.)

How to pick the best firm for you

• Match firm strength to property type: large firms (CBRE, Colliers, Cushman) for commercial/portfolio scale; FirstService and specialized regional managers for condos and rentals. (CBRE.ca)
• Compare services: leasing, facilities maintenance, accounting, tenant/owner portals, emergency response, and local licensing/insurance.
• Check references and recent client reviews, fee structure (management + markups), contract terms (notice periods, termination fees) and technology/reporting.
• For condos/strata, confirm experience with provincial condo/strata law and dispute handling.

If you want, I can:

• Narrow this to the best options in a specific city or province (Toronto, Vancouver, Calgary, Montreal, etc.), or
• Provide a short comparison (fees, services, pros/cons) for 3–5 shortlisted companies tailored to your property type.

Which province/city and property type should I focus on?