This is a fair question and I actually heard the latest BP podcast that talked a little about this problem, I will leave the link here so you can listen to it fully: https://www.biggerpockets.com/blog/biggerpockets-podcast-349-nathan-taborIn my opinion there is no way of knowing if the market will crash now or in 10 years from today, but knowing that it is an extremely hot market and more and more people want to get in I would be a little bit more afraid. 

They usually leave keys in a lockbox outside the PM office (we usually arrive after hours and inspect on a weekend while their office is closed). 

Newton in general is pretty isolated from economy crash.

You'll probably arrive at this conclusion eventually and any time between then and now is just lost rent, so cut to the chase and do it immediately.

@Tai Bhattad, nothing has arrived via email

Here are some ideas:Bulletin boards of local gathering places like coffeehouses.Medical school, law school, or other graduate school program housing boards.Hospitals and businesses that are attracting new arrivals to your city.Places of worship.Community centers.Hobbyist groups.Neighborhood online sites like Nextdoor

Do you use it for certain monthly bills and just pay it when the statement arrives?

He purchased before the 08'crash for 630k.

I recently read a chart that compared our last run up and subsequent crash to today’s market conditions and it shows that the affordability index is higher now than in the last segment leading me to believe we can still have some more price appreciation.

We're living in California now, and our property will be a quad in AZ, so I'm trying to do a crash course on landlord/tenant laws and practices in AZ.