A rehab having a structure to work with and having to build new structure will change the budget drastically .

Land appreciates in value, buildings depreciate.

We did build a calculator for this. 

My 2nd duplex was a new build in Indiana. 

Is there a way to use preferred equity lenders to facilitate this goal?

The heights recently underwent change in zoning, so investors/developers are beginning to pay more per lot to build.

As far as the other units most policies have "building and ordinance" clauses which proved some coverage if you have to update to "Code" but if the other units aren't damaged and are still up to code I wouldn't think there would be an extra coverage provided.I urge you to go into the process treating the insurance company as a partner not as their going to screw you no matter what :). 

As we all know, REI is a very powerful tool to building LONG TERM WEALTH.

I see the advantages with DSCR… in that unlike conventional mortgages which have a 10 property cap, and it becomes exponentially harder to purchase each time… DSCR allows you to build a portfolio. 

How can I get an FHA Loan for an auctioned home when FHA Loan requires an inspector to come check out the building and auctioned homes generally don't allow for people to inspect the house until after purchase?