We have three potential options.The first option is for me to completely owner-finance his purchase.

I am going to finish the rehab and get it rented then resubmit for a rental loan.I have used Cashcall Mortgage twice and have been very happy with them but Elite seems to be more flexible and have more options so was going to see if they are competitive.

DSCR Loans: What Are They And How To Get The Best Termshttps://www.biggerpockets.com/...DSCR Loans: How To Use Pro Strategies To Save More And Make Morehttps://www.biggerpockets.com/...Multifamily DSCR Loans: A New High-Impact Loan Option For Real Estate Investors?

Your mentor’s advice about starting with a rental property is solid, and a duplex could be a great option for house hacking.

We've seen 3% for 100+ unit apartment complexes, but they also have onsite staff not included in the 3% management fee.Two other pricing options to properly understand:1) Fee charged based upon tenant payments or just occupancy.

I see 3-5 as a fad.Fractional ownership - way to much overhead for these to be profitable. think "timeshare".STR in non traditional markets - running a STR is a business and real estate, boils down to location location location - who would want to go to a conference and stay in a STR vs. the hotel where the conference is at, most businesses pay for this I do not see why.Mixed use with green - this has been going on for years- it will continue but it is also more expensive to build - which means higher costs to use.Not trying to be debbie downer, I have seen these attempted to be done in the past and they really have not been successful.I do really like the BTR model though as I continue to see that as a very good option in the future. 

Investors are already on board with the options weve got, just shopping for the best option.

I know the seacoast of NH has been mentioned here but I wanted to point out a few options that could be considered.Hampton, a popular coastal town, has strong demand for multifamily units near the beach and a robust short-term rental market, especially in summer.

The only other option I see is a short sale, if you don't need to purchase for a few years and don't mind a temporary credit hit to save the $60k.  

To leverage the equity for financing my next deal, a second mortgage seems like a more cost-effective option.