Some companies will write a 2 family but not a 3 family. 

If keeping the deposit was a condition of the lease break, you should have put that in writing.

If the seller doesn't have a realtor, you can pay an attorney to write up a standard contract for a lot less than that.

Is it possible to also write off the other common deductions (PMI, interest, depreciation) while living here? 

But you need that standard in writing and published and to follow it to avoid any discrimination issues.

Are you looking for a vacation spot because you want to buy a short term rental, because you want the opportunity to write off vacations because you're checking on your investment, or do you have another reason? 

I would just write up a new lease with the remaining tenant for however long is remaining on their lease. 

Once you establish your lender and get terms in writing for the initial purchase and rehab loan, (most Hard Money lenders only require a few bits of information such as property address, purchase price, Rehab amount,  ARV, FICO, cash on hand and experience level), request a pre-approval letter and make your offer! 

@Eric James does the wholesaler write his/her own contract?

I'm writing my own specifically for extended stay rentals.