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.

How about a concrete one?

Specifically from the Caged AC Unit into the attic (concrete slab so no crawl space).I was thinking of just building a tall vertical box to place this into.  

You need to polish your skills, bigger pockets is a great place to start... find a local wholesaler you can work for/with and he will guide you. 

Make sure its on a permanent foundation, has concrete pillars, skirting and axles removed and in some states require hurricane Tie downs. 

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.

Quote from @Paul Gupta: Hi, in California, For jobs requiring a license, there was CSLB (contractor state licensing board) which would give either a General Contractor license, or specialty licenses by trade (~60 specialties such as concrete, welding tile, ) https://www.cslb.ca.gov/about_us/library/licensing_classific...My Q: does Maryland and DC area have similar requirements? 

Oh the pink and beige house with the tall concrete fence?").

But since you don’t know about the concrete pads how they will settle they have full rebuild coverage.  

Plus the house is all concrete and 3 stories.