Lots of units.  

These homes are called auxillary dwelling units (ADU).

I first started my real state journey back in 2017 when I purchased a SFH (in Toronto Canada), but rehabbed the basement to a one bedroom apartment, making it a two unit home.

Since you will be taking over and being responsible for the unit.

Based on comps from sales in the current market.2) How much will it cost to get the unit saleable?

Two things to consider, does splitting the lot in two lots increase the property's value, and do higher interest rates on a multifamily property (5+ units) negatively impact your cash flow?

You could show photos of the one that's done and provide a disclaimer that says something along the lines of 'this is not the actual unit, although the available listing has the same layout, features and furnishings.' 

Buying student rentals at the moment is incredibly complicated, though- areas that have been students for decades were just rezoned so that no more than 2 unrelated occupants can be in a single unit.

I am using the OHFA downpayment assistance and it works for 2 - 4 units.

What's your estimate on rehabbing one or both units?