If its not leaking RIGHT NOW and its still making hot water, you have time to get more estimates.

After having one leak out of the bottom and flood the basement I now don't take that chance.If you get enough SFH you can definitely trade up with a 1031 exchange for a Multi family.

My biggest concerns were the electrical building was built in 1920, plumbing, and roof (it had been updated in the past 5 years as well, but it has 2 skylights that as we all lnow are subject to leaking that they left in place.

Repaired hvac, and fixed a plumbing leak in the attic.

My Father in law had one and it never leaked, but he had it less than a decade.What is the cost of those types of tubs?

The upper one was leaking a bit of CO so that one was expected.

Winter comes, pipes break, water leaks, basements flood. 

And see if the column issue is foundation related.Your price should reflect the need for a new HVAC system and water heater.Toilets are a cheap fix, but ask if they are leaking and if there is damage from leaking. 

The building currently has a significant roof leak.

I've bought plenty of properties with active roof leaks and had them insured the day I bought them and I generally get the roof replaced before they even get around to having the inspector come out.