It is an older property (1870s) and we are getting in shape as we can. 

I keep my units in good shape so its not really a burden.

Read the market trend for the area.

Otherwise, the property looks to be in decent shape.

If so, then you would want to run comps based on the trend of the neighborhood. 

In your experience what are some trends you are seeing with respect to population growth or decline, the economy and growth or decline in the rental market?

It is not an ideal situation but because of the instant equity and proof of a trend of appreciation in the area, I am strongly considering it.

For simplicity, assume all units are equal size, niceness, and cost.Before receiving any data on the submarket (shared above), I initially used a 25% vacancy based on:19.9% (20%) class B vacancy across Metro-Detroit currentlyincrease 5% (to 25%) because unemployment is currently near record lowsI further expect unemployment to gradually trend up over 10-15 years due to automation & A.I.25% vacancy won't fly with the broker or seller given the submarket data available, however, the submarket isn't the nicest of areas and isn't exactly up-and-coming.

I feel like my house is in really good shape.  

If they want to stay and start paying you, as the new owner, ongoing rent, then you're in good shape.