There are a lot of positive ROI options in that bucket.To answer your question anything on the beach will rent well. 

Note these are only residential options. 

If they do, your best bet is a local community bank that funds these types of properties.Another option is a private lender but that money will be pretty expensive, as mentioned 10%  + 

I am looking into my STR options but from what I have learned this is a overflowing market in the area and the vacancy's are increasing so I may look into mid term and long term only.

none of the above  Any insight into other options?

THat we have seen (but you pay a hefty price to borrow for that type of thing) which is basically borrowing at credit card rates so you need to have a locked in buyer on the back end.Other option is an equity partner as you mention but lets say its worth $750k (not sure value) - maybe get someone to put in 25-50% max. but they will want a considerable portion of the upside and want to see a definitive exit strategy.

Cleveland almost seems like the best option because of the affordability and rental demand, but worries me due to the high property taxes and lack of population and economic growth.

I don't have personal recommendations but a Google search of "eviction attorney San Diego" turned up a lot of options.

Alternatives include seller financing, a lease option, or using an LLC or trust to structure the deal while maintaining tax benefits.

Since you're putting 15%-20% down, a conventional investment loan will likely be your best option.