Would taking out $50k now decrease your payout by $250 in the future? 

Might want to talk to the student loan companies to see what your options are in terms of either lowering monthly payments or getting them deferred for a time until you can pay off the other debts and if you are able to decrease those payments put every bit of the money you aren't paying on them on the other debts.

@Sorin Ciobanu try not to use all caps, that being said if you can get a lower rate and the fees aren't bad and the payment stays the same or decreases then you should do it assuming you plan to keep the properties however your current rates seem decent so I wouldn't stress on this too much.

The test is whether the use of debt increases or decreases your net worth.

Closing decreases your available credit, so could actually help if you are trying to get a loan.In my experience the thing that propelled my score highest in my younger days was installment loans on automobiles.

The home would typically decrease over time but the land should appreciate .

Since you are technically more heavily invested as time goes on, with more equity-or cash- in the deal, but your stabilized cash flow stays the same (or increases marginally w rent escalations), your cash on cash return would decrease year over year. 

There were a couple of times, I thought I was at risk of an increase but in every case, they stayed the same or decreased.

Goal: Increase their income or decrease there expenses so they are living in there means.  

Try to understand the cycle of the local market to see when it would be best for your to have your rentals come up for renewal in an effort to maximize your rent roll and decrease vacancy rates.