Depending on how strict they are, they could make you tear them down or at least bring them up to current code with inspections.You might want to go down to the Building Dept (or call) and ask (without giving an address) what they would recommend.

For a brand new agent, it’s valuable education getting training, learning all the necessary tools to legally represent a client the sale or purchase of their home or commercial building. 

You may not find one exactly like yours or in the exact neighborhood, but surely there's something close.

Came across this Deal from heritagegroupcapital.com, They are buying 2, 100k industrial fully tenanted/leased buildings in North East Indiana, near Fort Wayne.

Don't make asks, just ask questions.You take that relationship building and add to it podcasts with guests specific to multifamily and books on multifamily so you fully vet that as an option.

I am building houses on these lots and wish to sell to people who have capital gains so that they can benefit from the tax breaks.  

Should I prioritize market research or focus on building a network of industry contacts?

Building Cost: - I've heard varying estimates $/ft for capex related to building a climate control facility, but what can I expect generally in total $/ft for an assumption when building 150 or 250 unit building.

First, build the actual business in theory with a brand.Second, go to every real estate investor meetup in the area and see if this is something that people would pay for and if so, how much.

I would rather have a 50-year-old home that's renovated than a new build.