Does changing my piping involving pretty much making me redo like a third or fourth of my renovations for bathroom and kitchen due to all the cuts they have to make or can really good plumbers just make minimal cuts into drywall, cabinets, etc.

Which part is against the tax law?

I've heard of people doing it 'under the table' but what's the best way to do it for both parties? 

We would be installing a street and double stacking townhome style units on each side.I part I don’t have experience with necessarily is how to better understand infrastructure and site work cost (road, utilities, excavating, etc.

Now you do the third build…what does the lender do?  

Get an appraisal from a disinterested party.

Also which party in the home buying process would be looking for these things ?

Good LuckTypically multifamily is 5 units or more and Single Families are 1-4 units, so I was confused, so thanks for the clarification  Actually, that part is only half true because there are additional criteria that need to be considered to be multifamily vs SFR, such as separate utilities, heating systems, how they are attached to one another (Vertically vs horizontally), etcan easy way to differentiate and communicate is to call it multifamily if it has more than 5 units. and Single family for 1-4 units or call it how it is duplexI own several duplexes that are considered single-family homes by the city.In the end, it is your decision on how to use it

While creating an LLC is a fairly simple process that anyone can do the more difficult part is the OA.

How this capital is accounted for depends on any agreements made between parties.