Aside all that, as others mentioned, you didn't lend enough info to give any specific answer to your specific situation.

I am seeking a partner with significant financial resources to help bring my vision to life.I am open to any advice or ideas you might have.Thank you, I agree with Jay, you will not find a lender to lend on this type of project but you are going to need to bring in an equity partner.

Be prepared that they will be promoting an optional mentorship program at the end.

An assistant can do most everything that you need done and they work directly for you rather than a property management company that has several clients and you’re just one of them.Also, again, depending on the location of your properties, have you considered doing a lease with the option to buy?  

But like @Henry Clark said and others in this post there are options you can consider.

Now, getting around the Due on Sale might be as easy as doing a Contract for Deed or a Purchase Option instead of Sub-to.

Rates may still be high, but sometimes they’re more flexible with repayment options than a mortgage refi.Family Loan Structure: Since you have an existing interest-free loan from family, you could talk to them about restructuring or even adding onto it, if they’re open to it.

Quote from @Catherine Ding: My PM company is offering to do it for a high fee of $100/month so I'm trying to find alternative options.

.: Quote from @Donald Hatter: Option 2 is the last option I would suggest.

I would check and see how many 1 bed and 2 bed options there are and what they are priced at because most folks will prefer the full place to themselves so rooming 2 people together could make getting bookings a bit more difficult (not always the case but something to consider)