When you start accumulating multiple properties, you may to choose to increase your reserves at a decreasing rate if you have some scaling with your increased door-count.

However, if the expenses are actually going up faster than the rent, the value of the property may drastically decrease over time?

In that case, pass on the deal, or calculate your ROI and your offer price that reflects the likely decrease in market rents.

That said, how much $ are we talking and is this person the kind of neighbor that would cause enough stress to make you wish you just paid up? 

I want to be sure that I can provide the best service possible for my clients so that their journey is a lot less stressful than what mine has been.

We actually refinanced and paid the property down because we would like to eventually have our rentals paid off and it increases the cash flow, which decreases the risk substantially for us.

Moreover, the purchaser may also be stressing the deal at either a higher cap rate and/or internal rate of return due to the risk of a 100% vacant building. 

You can create value of an apartment building by increasing rent and or decreasing expenses.  

We've seen a decrease in active listings of about 15%+ from this time a year ago. 

Everyone knows long distance is stressful and most of the time it doesn't work out.