How to verify the Number of units? Additions, on old multifamily

[Susan O.]

How to verify the Number of units? Additions, on old multifamily

We're buying a property that is in an R3 zoned space and it's advertised as 5 units but it appears like some are converted garage or converted patio or something like that.  We couldn't find anything from the city as to when it was converted or how many units are supposed to be in the building.  The zoning is R3 for multifamily, but the whole thing seems fishy. But the county tax assessor does show it as 5 units.