Not renewing a tenant cause they pay in the grace period maybe short sighted because turnover and vacancy costs money.  

However, if you add money out of pocket to pay down the principle, that comes out of your pocket and becomes an added cost that you pay...instead of your tenant (and your tenant wasn't complaining about buy your property for you (rent).So, if you make an offer higher than asking price, but negotiate terms that include a lower DP and lower interest rate, your cost (DP) is less, and your cash flow could be more. 

Expect a lot of things like this to continue to happen if investing sight unseen.

. $300 is going to principle then even if you had to feed it an extra $150 until rents increase, it isnt so bad.)These are long-term plays..try to find a 4 plex even if you have to bump up your price range, you will get some credit with the loan for the additional rent and it will probably help your cash flow. 

You can use principles from the installment sale, specifically Deferred Sales Trust, in this situation.

You can charge the principle and interest day one.

There's a huge housing shortage in this town and no relief in sight, so I could lease it within 48 hours, typically.

Get out of your income repayment plan and make huge payments towards your loan principle every month until the debt is gone.

I didn't restore eligibility, and they would not allow cash-out on this program, but by refinancing a lower principle and lower rate, I boosted my monthly cash flow considerably.

@Jason Smith That principle is tried and true, trust but verify is most essential to all decisions reliant upon other contributions.