Brett, can you add to this DST "trust account", ie if I sell multiple properties in 2-4 transactions, can they be maintained in the same trust?

You can even have multiple DBAs. 

Is this something you have done multiple times?

I don't invest overseas, but I do invest in multiple markets across the U.S.

Your best bet is to get on the phone, get multiple opinions, multiple quotes, and make decisions on the type of build before pulling the trigger.

I am sure there are people who did it, even on this forum I saw posts by multiple users who claimed that they were successful doing this method.

There will be more wear and tear and multiple headaches with several different renters.

Typically a solid GP would reach at a 2x multiple in 5 years, taking your 500k to 1MM.

Similar for bathrooms if virtually all are multi bathroom but you find a single bathroom, making it multi bathroom via new construction could be a value add.There are more sophisticated value adds such as add multiple adus via bonus density program.  

I've seen banks be very competitive with blanket loans that cover multiple properties and/or multi-family properties, e.g. 5+ units.Mortgage Brokers (obviously I'm biased) - Brokers have the ability to work with all of the above and can get you to the best lender for your scenario right away instead of having you waste your time with the wrong type of lender.