For people in the Brooklyn area, do you have any cement/concrete professional that you'd recommend? 

I'm in the Brockton line next to west bridgewater area.

I have a property that I have rehabbed that is in a D level area that I would want to off load after a time anyways and was wanting to know how everyone goes about doing this.Do you have a contract that says something like "you rent from me for 3 years and then pay 100k over remaining balance of my mortgage"?

Should they be made into a small common area that the main unit also has access to?

Have a plan B if you're in an area in which ST rentals could get banned.

What sort of business do you use it for, and do you think you might choose something else if you had a different business area/model?

Unless you are a veteran or using a DPA program all loan products require some skin in the game (down payment) and that is how most people start their portfolios. 

This is a Maryland Historical Property, zoned for residential high density, with specific limitations on its usage due to its zoning.The property is massive, offering 8,276 square ft of space, including 5,445 square ft of finished area, and it features a substantial driveway.

You have to know what $200k smells like in your area and feels like.

Additionally, if an architect has what’s called an NCARB certification, they can obtain their license in other states to expand coverage areas and take on similar projects in new locations.