If they're 10 year tenants, you might have an opportunity to increase rents as well! 

We had our second home rented out before the closing.At this point and after reading numerous books on real estate, I realized that although we had reached our goal of owning a rental, our finances were completely vertical and I need to spread out to increase cash flow and reduce the impact of a vacant property.In January 2016, I started data basing different markets across the USA.

I know our firm starts to modify standard emails and calendaring features we send to clients right around the 2nd week of October every year to address this very issue.  

Assuming that he or she wishes to protect their investment, there will be a rehab which will in a small way begin to raise the standard in these areas.  

Also, any potential pay increases, windfalls, inheritances, etc are not included.

However, be careful you properly forecast for increases in the property taxes.  

So take your estimate and increase it by 10 or 20%.You don't want to invest in thin deals especially with an HML lender.

Large luxury apartment complexes have been built over the years around the area meaning the rental business is increasing.

Your cash flow and equity increases become bargaining chips for your Applications to keep borrowing, to buy MORE bargain cash-flowing investments!

Trust me, when you lower your price and increase an investors yield, the note is more liquid.