I would like to think it is worth it, and that I could run a business model that serves fewer customers really well rather than deliver basic services at scale.  

Mitch,It sounds like you've had a successful run with your rental properties in College Station/Bryan - I'm impressed!

I was recently sent details about a 20-unit apartment complex that I’m interested in, but the seller's asking price doesn’t align with the numbers I’ve run.

Depending on the flooring specs you *might* be out of luck because a lot of LVP/laminate type flooring specifies on the install that straight runs will be no longer than X number of feet and room changes will be installed with a transition.

Maybe run this by your real estate attorney before moving forward. 

Ebooks, podcasts like @Bonnie Low suggested and start running numbers on every deal you see until you know how it all works.

Williams I went with propstream mainly because of what @Barry Pekin said; it gives you a ton of data which is great for running comps and doing research on properties.

Doing this would put my new properties making next to nothing, running some rough numbers I may make $100 or $150 per month on new properties with mortgages that are around $1,500 per month. 

We Normally put steel posts nearby so no one runs into them.In the third picture one unit is just in front of the picture, then a second unit is at the far end on a post.These can be set off by deep fog, rain or sleet. 

I also run investor retreats out of them so they serve multiple purposes.I would say that it takes a specific person who wants to invest in Costa Rica.