Same things with "landlord shall provide tenant with a copy of the rules and regulations" or "tenant acknowledges receipt of keys"--it seems those items don't belong in this year's lease, but last year's, but I am not sure if I should write something for this year's lease.Last year two addenda were signed: mold and ventilation, and pets.

I pretty much took strictly business courses.

I have replaced decking on roofs in Wichita Falls, and have never been required to use anything other than standard decking from Home Depot.I suggest you call Building Inspection and ask about the regulations regarding roof decking specific to your project. 

Ultimately Vancouver is the better option if you are looking at it strictly as an investment, lower FMVs, similar rents, lower property taxes, etc.

Now, if your paramaters are strictly "good targets for investment" then you can define what that means and see if an agent can help you locate potential investments that meet that criteria.

So, with these being vacant and my company is now the recorded lender, how far can I take a preservation service without violating any regulations?

The pet(s) and Tenant(s) will comply with all Rules, Laws and Regulations of the Owners’ Association (if any) and legal jurisdiction that the city of Virginia Beach, VA requires; including licensing.

A duplex here is appraised strictly on a comparable-sale basis.

Depending on condition (look up "friable") and local regulations, you might be permitted to take it up yourself; you would then have to identify a dump site that will allow you to dispose of it, and you will have to follow their rules for disposal.

It doesn't cover repairs and has some pretty strict qualifications and take a long time.