I do agree that you should take into account opportunity costs when deciding to file, but you definitely have to weigh that against the additional administrative costs. 

Tenants are able to have maintenance requests if needed and pay their rent through the database.

Details about deal1970 46 unit apartment in the DFW area.26 units are 1 bedrm, 1bathroom | rent $990 |security deposit $10020 units are 2bedrm, 1.5bathrm | rent $1230 |security deposit $200Asking price is $5,200,000 | NOI=$217k | Cap Rate=4.17RevenuesTotal Revenue=$567,776 | Net rental revenue=$449,923rental losses=$117853Other revenues (application fee, pet fees, deposit forfeitures) =$59,766Total Revenue=$509,689Operating ExpensesTotal personnel expenses=$88,603Total property administrative expenses=$28,277Total Leasing expenses=$4907Total utility expenses=$36,991Total service expenses=$10,953Total cleaning and decorating=$16,305Total repairs and maintenance=$14,468Total property taxes=$78,731Total Hazard insurance=$27,107Total operating expense=$334,042 (65.5%)Net Operating Income=$175,646Total non-recurring replacements=$25,086Available for debt service=$25086

For a huge single-family house with many bedrooms and a guest house, we are considering Airbnb STRs, a bed and breakfast type of thing.Please suggest a property management company in Houston.Or would it make sense to hire a live-in property manager/ administrator?

The administration and use of a Solo 401(k) while not overly complex, are a specialty field and there are important things to know.Check the forums and you will quickly see who offers such plans.  

If you haven't already, you can ask your plan administrator about this feature. 

I research the tax delinquent data bases for my acquisitions.

Because if you closed without a qualified intermediary in place to administrate the 1031 you cannot go forward with the 1031. 

This is assuming you have a valid rental license and all administrative paperwork in order. 

There have been several opportunities for financial assistance for citizens to take advantage of if used properly.Prior to the Biden administration, the Trump administration passed the CARES Act which was an initial $2.2 trillion signed March 27, 2020, when the pandemic first began.