Those citywide numbers describe the whole residential market, houses included, and a specific duplex or fourplex still needs its own analysis based on rent roll, vacancy and carrying costs rather than a market-wide direction.
Financing also moves independently of the citywide trend. Lenders typically require a larger down payment on an investment purchase than on an owner-occupied home, and documented rental history or a market rent appraisal before approving the mortgage.
Joel Dyck reads the citywide trend alongside the specific property's own numbers, since the two do not always point the same direction. Get your hand-reviewed valuation from Joel Dyck.