"how to analyze a deal" is pretty broad.a few general reactions.

However in speaking with them and learning about their loan product, their funding for ground up SFH/Condo for-sale housing units was pretty aggressive. 

If you're considering a 1031 exchange for a property that has been cost segregated, especially if placed in service recently, and double so if it's an STR - advance planning can save you a pretty penny.

The interest on the refinanced loan can still be deductible, as long as the funds are used for business or investment purposes, like buying another rental property.Since you’ve owned both properties for decades, your depreciation basis is likely pretty low, so a future sale would trigger large capital gains and depreciation recapture.

good luck, and its all pretty logical, just do the work upfront to verify information and you'll find a great tenant.

The issue you have as you scale is that these are not designed for business use, and if they flag you as a business they will shut you down pretty quickly. 

. ^ These are pretty well known methods and have works well for me.

Outside of owning the center or similar strip mall, we are seeing pretty big opportunities in development of the asset class and or re-development. 

I'm happy to answer any questions about the marina industry, keeping in mind I'm pretty new to the space.

BUT when people have a few 100k+ they talk about finances pretty openly because they want to help others.