There's a big difference in the order of payout in the event of a claim.If the buyer defaults on the payments or any other stipulations of the note, you will need to hire an attorney to foreclose and get the property back.

We have only a few stipulations about where to move to and start anew: We like a warmer climate, and we want a good market to start our portfolio!

One crucial stipulation is that the property must be rented for 7 days or less on average.

If they don't pay it, the buyer-agent agreement will stipulate that buyers pay.

Am I able to move with an FHA loan from a multi-family property to a single family house in less than a year as stipulated by FHA?

In that contract, they will stipulate how much their buyer has to pay them for their services.

If you are paying cash for keys a very important stipulation is that they do not receive the cash until you receive the keys and they are totally moved out. 

Are there any other major stipulations to consider?

their bookkeeping software leaves a bit to be desired though, i always have trouble connecting my bank accts so i just manually upload the file monthly now. i'll live. i like how simple it is. with RR tenants can pay through the app, they get reminders, you can manually send reminders, they can make partial payments throughout the month, you can pay $5/unit to have their on-time payments reported to the credit bureau to help build their credit, you can do apps and background/credit/eviction report on there.. and yeah in MA there are just so many stipulations around how security deposits can be used i'd rather just not even deal with it. 

Typically, any 10% 2nd home loan has that stipulation.