We got it under contract but then canceled the contract after some concerns with the foundation.

Budget these carefully into your overall project plan to avoid surprises.Rehab Budget: Ensure that bids are received from multiple contractors and that adequate reserves are made for cost overruns.ARV: Be conservative on your ARV since the appraisal concerns one person’s opinion.

While $50/month in cash flow isn’t great, it’s still positive, and cutting the termite protection could boost it to $125.

OTRCH operates a couple of what I call "wet rehab" centers meaning congregate housing for persons otherwise homeless and there are several other agencies like "First Step House" etc. that might be interested in a presence in this block.Or you could cut your losses and put it back on the market under the "greater fool theory."  

Save $$$, get creative on a rehab to cut the budget, look for cheaper RE, or leverage PM.

However, and I don't know anything about AirBnB in Denver, but my biggest concern for this project is the ability to consistently rent the basement for $1,800. 

I got into this by accident when i took a job via upwork as a VA  for Vontive and stated at interview  i could lower there costs and stress by automating there lead gen.I automated the lead gen and they didnt need 5 0f the 6 VAs they hired and we cut there costs by nearly 60%.Thats when i realised that you could automate even the cross platform data scraping.Then i got some extra clients from Upwork and now Im on here to help, offer the same and expand to others.going to the recorder office/courtYou only need to go to the physical building if thre is information on the documents that you need but cant view online.

The fact that you cannot find much information about their LLC is not a concern.  

Need I be concerned with UBTI?

We are trying to cut costs on the ones we are doing now, but still trying to keep the quality high.