These camera's use battery that last almost 2 weeks and take tmobile SIM card pre paid .

I would guess that a significant portion of the closing fees is prepaid expenses into escrow, which is really just putting money into your own pocket, but tough to know without seeing the breakdown.

Prepaid insurance and taxes, closing costs, ample reserves, etc.

Many prepaid expenses and costs of financing are not. 

Normally the rent would be paid as usual, and the pro-ration would be done in the closing accounting along with other prepaids like taxes etc.

Prepaid credit card, prepaid loan, within a year or two you will have established decent credit.

You don't have to worry about paying for loan origination fees, prepaids, discount points, etc and you won't need any form of down payment and your monthly payments (even after paying 2 separate bills, the mortgage and the seller carry) you still will only pay roughly the same amount that you would have paid had you just got a regular mortgage. 

I think its actually included in your cost basis along with the other closing costs (not prepaids and escrows).I didn't think this tax treatment was pro rated. 

"Cash to Close" is much greater than buyers expect“Cash to close” includes the entire down payment, all closing costs, transfer taxes, and prepaid interest, property taxes, and insurance.And the final number is almost always larger than most buyers expect.

Quote from @Matt Robinson: Assumptions are dangerous, my friend.You should contact the PM with a list of what needs to be transferred: security deposit, prepaid funds, application, lease agreement, spare keys or codes, etc.