521 20 Avenue Southwest is a three-storey, low-rise apartment building in Cliff Bungalow, Calgary, constructed in 1980. The building comprises 20 units. The City of Calgary's 2026 assessed value for units in this building averages approximately $189,000. Before committing to a purchase in this established property, prospective buyers should have the condo documents—including the reserve fund study, financial statements, board minutes, and bylaws—professionally reviewed to understand the building's financial health and any upcoming capital projects.