However now I am trying to figure out how my single-member LLC #1 can add a new member (my HSA) and be IRS compliant.

I recommend buying a copy of whatever code is used in your area.If all this work was done some time ago it may not be fully compliant with current codes.A good place to start is a discussion with the planning and zoning commission.

In addition you need to be compliant with the new MARS short sale disclosures.

We are just finishing drywall on a full gut reno of an 1100 - 1200 ft^2 2-story unit and have already had two people approach us and take-away applications to rent it.One question though:  Why renovate the entire bathroom and not replace the flush with a newer, Watersense compliant model?

I say this on the hunch that most of the current owners renovations are not compliant with current building or fire codes and that we always endeavour to make our old buildings as energy efficient as practical.  

Sub-standard fusing and non-compliant outlets. 

I paid for their services out of my SDIRA to again remain compliant with the IRS.7.

Commercials have lesser COs, unless it is a code compliant issues, there is no reason to change the approved plans.

Specialty Loan Servicing No Collection program for non-performing Loans, is an offsite program where [servicer name] is the required compliant Servicer of Record, and the Lender pursues their own workouts including collection calls, loan modifications, foreclosures, Deed in Lieu, etc.

Additionally new laws in Texas have made it much harder and more costly to "go after" non-compliant homeowners.