A duplex can be evaluated in the same way that investors value apartment buildings.
The rental income and expenses for both rental units should be combined to determine the Net Operating Income (NOI). Investors can then apply an appropriate cap rate to the NOI to arrive at a valuation. As is the case with any investment property, investors will need to make an estimate of the required Annual Capital Expenditures, since this figure influences the cap rate.
For tools and resources to determine the cap rate and valuation for duplex rental properties,