The brother and wife next door however... they had one more child over the past year (seems wife was already in first stages of pregnancy but did not disclose on application) - nothing against kids, but there have started to be plumbing issues and come to find among some pre-existing issue with buried pipes, they're also clogged with baby wipes; they pay late, and are not keeping up with the property upkeep as outlined in lease. 

I just closed on my first property and we had a similar issue with one of the preexisting tenants.

I'm curious about your past experiences meeting with pre-existing tenants... 

I'm curious about your past experiences meeting with pre-existing tenants...

@James Brewer, yes you can keep the pre-existing mortgage and change title to a single member LLC. 

Does anyone have a suggestion for us drafting some kind of agreement to let him stay for the 60 days to give him adequate time to find a new home, but for us to not be liable for pre-existing conditions once we take ownership of the property?

Old pre-existing pipes or existing copper wire to me would not count as building materials but you may get a liberal claims adjuster to see it in your favor I wouldn't count on it. 

Schedule an inspection with one week so I know what I'm working with, can document condition so Tenant can't claim certain damage was pre-existing, and determine if they are any maintenance issues that require attention.

Curious about both pre-existing homes and new construction, i.e. whether or not appraisals more closely match closing prices for new construction.

I purchased the property with work done preexisting and would like to finish the project.