By doing that, they comply with Denver's primary residence stipulation, the full-time tenant gets lower rent than they would otherwise, and the landlord gets a higher rental rate.I'm going to talk with them more regarding some details, but it's looking like a pretty good arrangement for me at this point.

Of coarse prior to buying you can put in stipulation clauses and there’s various things you can do to get around this prior to closing 

Do I wait until I find another good deal to 1031 into and risk having to sell for less because I wouldn't have to time to let the 4 unit sit on the market waiting for a cash or strong buyer who will not have an appraisal stipulation, or do I sell it now and risk not finding a great deal or no deal at all and paying the capital gain taxes?

VA loan is very strong thing to have access to, however, there are rules and stipulations around using it that prevent you from buying a property for investment only, it has to be owner occupied.

Question: Is there anyway I can write in the contract allowing him to stay for 6 month while having the title company hold in escrow a portion of the sale as a stipulation for him moving?

Depending on your plan, you can borrow up to two loans from your 401k without stipulations on how the funds are used/invested.

Does anyone ever tie the rehab contract with your contractor to the buyer's inspection? For example not paying them the final payment until the buyer's inspections gives the final approval? 

The bank is stipulating that I use a General Contractor from their approved list to handle the remaining work.

@Olivia Grabka, I thought with FHA you only had to occupy the property for 1yr, or does the stipulations vary state to state? 

Can I remind him that the lease stipulates late fee if rent is paid after the 5th and as of January it will be enforced?