It will continue on without extra fees or penalties without any further contributions besides organic gains and dividends.

Non-bank lenders can be @ 4.25% - 4.875% for a 30 yr fixed at max leverage against a portfolio.

I teach Continuing Professional Education (CPE) classes to CPAs to help them understand how to leverage the incredible tax benefits available to their clients who own commercial and residential rental properties.

Hey Tyler,Yes, paying off that mortgage would bring you positive cash flow but do you really want to dump that much cash without utilizing any leverage? 

Footage should only be brought into question over incidence, and not used as false leverage to question on comings and goings, who is brought in (such as dates) etc. as this would fall into harassment and a breach of lease as it pertains to the quiet  enjoyment and the very principal of their equitable interest as a leaseholder. 

Also, be organized and structured with your contractors

If you grew up in New England, do you have any other family or friends that you might be able to leverage in some of the neighboring cities or states that have more affordable housing?

In reference to leverage, it depends on what you are comfortable with.

This is leveraging other's experience and credibility to jumpstart your own.

So if you have limited time, you'll have to make sure to leverage a lot of people.