do you have an offer from a builder currently and by builder do you mean your house is a tear down and rebuild.. or just a rehabber who is looking to rehab the home and flip it ?

I'm selling four houses from one estate.

I was thinking about buying the land (maybe it is 20-30k for the .25 acre lot), finding a builder in the area, and seeing if I could build a ~1,250 sq ft 3/2 single family house and see if I could make the math work. 

Geographically locally where is your house in the landscaping?  

Just because a house is listed for $4,500 doesn't mean it rents for that price, or that it rents quickly.

Quote from @John Zhang: If I buy a house and use as long term rental, take bonus depreciation.

@Desiree Board For your mix of long-term rentals (LTRs), short-term rentals (STRs), and house flipping, an LLC is ideal for liability protection and pass-through taxation.

And on the houses I build I pay the lumber direclty myself I pay the roofer..

Make sure you get that landlord info of the housing before the one they are in now.

@Robert Marx of if I have a 5 bedroom house I’m wanting more than 2.5 bathrooms.