Personally a cash-out refi could help me get more quickly into all-cash BRRRs or a REI venture in Spain, however I don't know to what extent this is at the expense of rental cash flows, and what is the wiser decision long term.I've combed through posts online and looked for Excel templates to run some calcs and get a sense, but nothing really filled the void... 

These things hold their value amazingly well.If I had to guess, if you bought it for 40k and only used 9 or 10 times, the hours on the machine would be so low you could probably resell it for 35k or better (given that their retail value would go up over three years so the discount from say 48k to 40k might even mean you break even)..

Denton has suggested shortage of 4000 units right now.Some of these markets like Arlington, Denton and Edinburg have other demand drivers as a backup plan in case students shift to online or move away from going to college.

There is a ton of new/newer construction around there that has come online the last 2 years in the medical district and most of those buildings have had real challenges.

Check out other online guides available here: https://www.biggerpockets.com/guides3.

The agenda is jam-packed even more than usual this year so what you see online is just an agenda-at-a-glance.

How can my online presence help me to grow my real estate portfolio?

Not sure about your comment on paying close to retail at a tax deed sale. 

Purchase price: $500,000 Cash invested: $70,000 Sale price: $725,000 Creative financing purchase, fix/flip with retail sale.

LL Flooring, formerly known as Lumber Liquidators, is closing all 430 of its retail stores after failing to secure a buyer during its Chapter 11 bankruptcy process.