I think your best approach is to pretend you are the investor yourself, calculate build cost (mortgage with interest) + Maint / cap expenses/ management fees according to your zoning and then compare that to the average rent in that neighborhood.

BP can keep 10% as a service fee.  

Have a good lease with "teeth" - late fees for late rent, occupancy rules, pet rules and etc. - and do not violate your own lease by being too easy, or very quickly you will not have any lease at all and your tenant(s) will do whatever they want at your expense. 

The good news is sometimes you don’t need to pay the thousands in attorney fees.

Did you pay an auction premium like Auction.com or is the number you bid the final number plus recording fees? 

Just some wire fees and maybe termination fees from the custodian and your time to consider...

If this is financing for a stabilized property rate carries more importance but rate combined with origination fees, pre-payment penalty and term in which you intend on keeping the loan in place are all considerations which together should help in deciding the best financing option.

I’d suggest you call a PM or two and ask them 1) How much rent they would charge. 2) What fees they would charge you. 3) How long they think it would take to find a tenant at that rate.

They quoted me a rate, 1.5% origination fees and 999 service fees initially, I provided all the docs and worked with them for 3 weeks.

ya were we live ( personal resi) we have humungus doug fir trees 100 plus fee tall basically surrounding out lot and if one of those falls on your house it can destroy the house and if your really unlucky it can squash you..