It’s likely the GC will subcontract the concrete work to a specialist while they focus on managing the permitting process and ensuring everything is done to code—especially if there are ADA requirements involved for the ramp.Let me know if you need help navigating the process or any tips for working with contractors.

Construction is mainly CMU, Concrete, and Steel (at least for my projects), and there is a bottle neck of those resources as only few supply the area.

I rent out a 2 unit property in baltimore county. I just got a notice from the MD department of assessments & taxation that the value of my property will increase from 120k to 261k , spread out over 3 years equall...

Maybe concrete single-family 1-4 units depending on the price point and cash flow.Also there is no real MLS in Puerto Rico you need to find an agent for each area you want to look at.

Infeasible.To build out of concrete block. 

They said we have to build new walls because the old walls are directly on the concrete, and this is not allowed.

It is something I am interested in doing in the future, potentially even this year, but I am curious how to put concrete numbers to this decision.  

So yes, you can have solid concrete walls, it's still going to burn down.I have read that worst case up to 80 million Americans will relocate in the next three decades.

How about a concrete one?

It’s one of the few places where you can realistically achieve solid returns without needing a massive upfront investment.If you’re open to exploring other markets, Detroit might be worth considering.