First would be to set up an LLC with the partner and in your operating address how they are to be repaid and bought out of the LLC.  

Look on your county assessor's website to identify who the current owner is and their address.  

Aloha,I would be very concerned if I had a new property in Denver where the builder ADDED some insulation to address this issue.

I also have about 200 units and driving by every unit or stalking their Facebook is not my top priority, If something comes up or during an inspection we see something we will address it.By the way rich people with good jobs that live in expensive houses smoke weed and do drugs.

Give them the upstairs' contact information (name, address) as well as the HOA contact information. 

Aside from that, number one priority would be to address the plumbing issues.  

The property will be a Primary unit and a ADU unit, each with its separate address.

With housing in short supply, there are apparently plenty of people willing to wire thousands of dollars to someone they have never met, without any evidence that the person they are wiring the money to has access to or any association with the property.These types of scams are very common in the area, and I am wondering what "best practices" people use to avoid having their properties used by a third party to scam a prospective tenant.I am planning to add a watermark to my listing photos with an email address.

If you have already closed, can you share the address?  

On the other hand, an older house has been around so long that these types of problems have either occurred and been addressed by previous owners, or they're often plainly visible.