I know this is an unpopular opinion around here that you won’t see on the front page of the daily BiggerPockets newsletter, but it’s the truth For the record, I still believe a quality STR purchase offers a great ROI over the long term.  

If it was secured by real estate then there should be a mortgage recorded at the county and those get transferred by a corresponding assignment of mortgage.

You can probably just go ahead and live in that 5th unit, but I believe whenever you go to refinance it with a bank or what not, the 5th unit will make it require a commercial loan and not residential regardless of what the county records show the property to be. 

I don't necessarily need the standard features of pm software, such as rent collection, bookkeeping and maintenance requests, though that could help; but do need a clearinghouse of important information, such as leases, legal docs and other information; maintenance vendors I use; maintenance history; and some kind of tracking system, where I can record the various current projects I'm working on within the business.

He's right and if it does come to that, stick to the facts, keep a record of when everything happened.

This figure represents the highest employment rate ever recorded in Italy, indicating a positive trend despite remaining below the EU average. https://www.statista.com/topics/12899/employment-in-italy/2. 

The analysis also reports that new multifamily development will “remain near the average recorded over the past five years”.Integra Realty Resources’ 2017 Commercial Real Estate Trends Report ranks Pittsburgh #2 on its Top Markets by Multifamily Transaction Volume Based on YoY Change.Pittsburgh’s rental vacancy rate has declined by 25% over the last five years.Pittsburgh is booming with developments (see reference #6), “there is no better place to be a developer right now than in Pittsburgh.

Last I would see if there is a record of an oil tank.

@Jason Monaco I sent you a link to the recording.

If it’s verbal, they’ll need to document any prior communication or payment records to establish the relationship.If the PM is completely unresponsive, they may want to send a formal written demand for communication and payments via certified mail.