Buy the best house hack you can in Miami. 

The house is a 3-bedroom, 1-bathroom, 1,300 square foot home currently undergoing a full renovation (interior).

Refinance lender was ok and I'm actually using them again for a house hack but I don't think they'll be a top of my list for another BRRR refinance due to their restrictions.

Me and two other partners are flipping houses locally and are using a local individual for the financing.

Although in Canada it was/is the Ensuite room. and even here on Biggerpockets one lady got on about how she is lobbying in the state of Indiana to have the term Landlord removed from the vernacular and replace with  ( Housing Provider)  the thought being Landlord denotes Lord of the land and superiority over the tenant I guess is the point. 

A friend of mine wants to buy some land behind his house in southeastern MA.

I've been reading up on 203k loans as a means to acquire a main house and then fix up a garage as an ADU. 5.

I'd suggest possibly extending the house hack to another duplex or quad. 1-4 units are residential so will be easier to finance. 

They don't buy a lot, and even when they or any affordable housing developer buy land, it often can take forever for them to consider the property and then the actual escrow can be long if they are building the capital stack to buy the property. 

Taking this extra step ensures veterans have the same opportunity as others to compete in a tight housing market.