A numbers game implies you will eventually get success guaranteed.The fact of the matter is unless you target every single person in the USA, AND there is a guarantee that at least one person is motivated, AND there is a guarantee they get no other mailers, or temptation from competitors and they pick you... 

I should also mention that this property is a microloft (<300 sq ft) so fits just a single individual.

I'm a 20+ year landlord with a single family rental in San Diego County.

For example, I have a partner who lives in a single family home we own together.

Since each of your LLCs owns 50% of the holding company, but the holding company doesn’t own your individual LLCs, the IRS will likely treat your LLCs as separate, single-member LLCs for tax purposes.

My wife and I bought our first townhome in 2022, have steadily grown, and now have 5 townhomes and 1 single family home. 

I don't understand enough about it to know if them stocking up on single-family and small multi-family properties in the Denver area, at the current prices, is a good initial play that will hold up.

If they bought a single family or 2 to 4 unit in Texas it was at least 5 years ago.  

We purchased a single family home near Scusset Beach in Plymouth.

They start small, usually with single family or duplexes before expanding.