It hurts to let the 3.5% rate go but since you're not going to be able to rent that place out in the future I'd take advantage of the equity you have in it and start the investment road you're wanting to go down with a single family.

Have a substantial liability insurance amount and worry about an llc down the road while you are saving up to buy another.

IF the subject land is in city with  accessible roads contact Impressa- Ken Semler.

This can be a great solution but you need to fully understand what type of 2nd you're getting so you don't screw yourself down the road.

Do attorneys take criminal cases without getting paid a sum up front ? 

Criminals and homeless will typically move on to an easier target.It is better to spend $1,000 - $2,000 to properly secure the property than to continually deal with these problems and expenses.

This morning, before Milton makes landfall, I drove down the beaches, where boats still sit stranded in roads and parking lots from Helene.

If you are able, and I say IF you can find off market properties and you present your self to the seller as a wholesaler, that may be diffrent, but then you run into marketing real estate with out a license which if I understand correctly it's a criminal offense in nys.

Not to mention the fact that the criminals, once identified, can be counted on to dig themselves in even deeper on the way to realizing their jig is up. 

I would do some research on square footage and road frontage needed for parceling off additional lots (STR the house, sell off or build on additional lots).