If an HVAC system isn't on the scope of work, it could just mean that it didn't need replacing.

I'm doing some initial analysis and have spoken to Engineers/Architects/System Suppliers, which has been useful in building a framework.I would really appreciate connecting/speaking to developers that have hands on experience with historic adaptive reuse conversions, to get advice on the good, the bad and the ugly, and find out what to focus on and what they wish they knew earlier.Thanks in advance.

However, I'm currently trying to establish written systems and checklists for guiding myself through the process.

Ray, I daon't have any advice at my finger tips, however, I'm currently trying to establish written systems and checklists for guiding myself through the process.

Security system. 

Tenants have been cooperative and we haven't had any hiccups since the sewer line (fingers crossed)Another big lesson learned from the property has been that small mistakes can be way more costly on SFH because there isn't more cash flow to split the costs and all SFH are on there own systems.

If it happens again you could potentially send in a plumber to scope the plumbing system to see if they can locate the culprit. 

You don't need an LLC to protect your asset because property insurance will cover any losses and if you are worried then increase your insurance by another $2 million.You need some sort of accounting system e.g.

Brand new garage door opener systems range from $120 to $1100 depending on the bells and whistles that come with them, and they support a huge variety of garage door designs. 

The culture there supports a high standard of work ethic and the Latin family support system educating then young people with trade skills (you wont see family units teaching trade skills in Cedar Park or any other hipster location).