Using API's, GIS, webs scraping, and others is both interesting and challenging.

But for most individual values I used google to check those numbers (mostly from home repair web pages/blog posts posted in 2021 or 2022, as recent as I could find them). 

The web site shows these starting at around 65k so its an affordable option to consider if you don't qualify for a traditional loan and cannot find a hard money lender. 

Myrtle Beach is great fundamentally for a host of reasons including 20M+ visitors per year, a ton of long-term residential growth, and a wide range of properties to choose from (condos, condotels, SFH) but you need to make sure you are looking in the right condo complexes, right zoning and investing into the property itself to stand out from the crowd. 

Finding a good lender is lots of web searches and phone calls.  

If you go back to fundamental and think about why properties/anything  goes down or goes up depends on Supply and Demand.

I looked and vacancy rate and comps using Zillow and and web search I didn’t see any concern.

You'll see lots of people saying stuff like "travel has fundamentally changed forever" and yada yada, but that's exactly what people were saying about work from home stocks and tech growth stocks last year and now a lot of those are down 50%-90% while the broader stock market is only down 10-20%.I could potentially see something similar happen in the real estate where a travel pullback pulls the real estate market as a whole down a little bit, but the most dependent/bubbly locations where people only buy because of the travel market are effected far more.Again, I don't think it will happen, but it is far more plausible than people give it credit for. 

While I have never considered just buying one property to rent out, all the fundamentals of that choice are there (not enough senior housing for the spike we will see when the next generation reaches retirement, typically higher rents, etc.). 

And you can meet the timelines for each sale it is perfectly fine to sell the two and combine them into one replacement.It's called a consolidation exchange and is a fundamental 1031 process.