I do expect greater development of condos and townhomes and higher density single family communities. - Acreage will continue to be a very hot commodity.

The market still has relatively low entry points compared to other major cities, making it possible to find multifamily properties like duplexes and triplexes in the price range you’re targeting.

STR beach condo renovation slightly above builder's grade but not super high end.

Lots of sub $100k SFR and sub $150k duplexes with strong 1.25-1.50% rent rules.

You'll still have plenty of money to do a duplex/quadplex and give you breathing room (what would you do if you needed a large repair on the rental?).

I think it likely an appraiser will value your duplex with 2 ADUs via comps with quads, but recognize there is some risk assuming this.  

Not interested in Condos, developments unless distressed. 3.  

Each duplex was bought with an average purchase price of around $270K and is getting an average of $1350 a month in rent

For example, I bought a duplex in a B neighborhood called Reynoldsburg for $350,000 last year.

I own a duplex that was built in 1989 and has had 2 stable long term tenants with no interest in selling.