The roof was also a problem since it had wood shingles and apparently that is way more costly.

If you need to replace the roof).

Cost of labor has gone through the roof, as with materials, property tax, insurance, and even utility cost.

I.e. if they told you the roof was brand new, and upon physical inspection, you discover that the roof on a shed is brand new, but the main building needs a full replacement to the tune of $50k, that is not retracing a deal.  

Short-term not allowed by city.Condition: Built in 1930, All units are updated, newer roof, new windows, new foundations, new sewer, new electric/plumbing.

What about the roof ?   

He's already put a tarp over the leaking roof -- exactly what I planned to do, except I would have done it in brown instead of totally obvious blue).  

See it as just another expense, like replacing a roof.

This is after averaging out the costs of 1) roof, mechanicals, siding, flooring, etc. and dividing by their life span then also subtracting general maintenance costs (handyman type stuff frozen pipes, etc.) you see each year.

We are leasing a large industrial warehouse for 2 years to utilize as a build space to build the walls and parts of the roof in the warehouse and then shipping the pieces to be assembled onsite.