@Tom Server we have had owner/investors hire us when they’ve actually lived in a property (duplex/triplex) because they did not want to deal with the tenants or have the tenants know that they were the owner.

Do any STR beach rental property owners have any insights?

MLS, Zillow, Cold Calling/lead generating, Realtors, Mail Marketing, SEO/Online marketing...If you are going direct-to-owner (aka sourcing your own deals), you'll have the most and best options. 

Mark, I have myself, my wife (owner payments and bookkeeping), a second property manager, and an administrative assistant.

It takes us 18 to 36 months to get approvals So land owners here know that they will have to waite to get the big dollars..

Many STR owners have ventured into MTR to supplement their income and we have far more supply than we did 2 years ago.With your desired price range of under $100k inventory is likely to be very limited. 

Some states offer greater privacy protections for LLC owners than others.

Here in Texas the previous owner has 6months to 2 years to redeem with a penalty to reclaim the property. 

The owners kept on adding these weird additions till the 2000s.

I own a 4 unit building that I took over 2 years ago that were converted to condos a few owners ago.