With seller's permission: Unscrew the shower head and put it on shower floor.

Purchased for $139,999 using a mix of cash and hard money, we revamped it with modern updates, including a new kitchen, flooring, and fresh paint.The property rented for three years, generating steady cash flow of $450/month.

Floor plans?

That hard work includes making the investments that the current owner hasn't made (nicer kitchens, new flooring, fresh coat of paint, etc.), removing tenants and marketing to new tenants.

The couches and other furnature are outside on the porch, trash piled up, broken floor tiles and unkept yard. 

Upgrades include a fully remodeled kitchen, renovated bathrooms, new durable flooring, contemporary fixtures, and efficient heating and cooling systems.

I would just excavate a few 2'x2'x2' (or larger if possible) spot footings, w rebar and Simpson hardware,under the house (you will want to take up the floor to make this easier to do).

I'm fine with doing some minor fixes and improvements to a property: Adding overhead lighting/fans, better flooring, maybe redoing a main bathroom.

If not, the only requirement may be filing plans with the dept of buildings.One of our contractors does the bulk of his work on contracts with NYC.Mainly work related to bathrooms & tiles/flooring, I will shoot you a PM if I can get any information on this.All the best!

Keep the wood (or sheetrock if you choose) an inch or two off the floor to not wick water.