Lose the holier than thou attitude; this is personal finance not a religion3.

Your income isn't high enough for it to make sense as a rental and the closer you get to your residence limit the greater pressure you will have to sell it before losing your exclusion in whole or part. 500k right now can make $15k per year income with zero maintenance or tenant risks. 

The rental had ratty furniture, a record player prominently featured in the marketing but it had no speakers, missing basics items in the kitchen, lots of drunks in the concrete hallways that reverberated right into the bedroom at 2am, a strong odor of urine outside, and more.We have super hosts in this forum that have hundreds of 5-star reviews and are masters of the craft, but I look at their rentals and see they don't have any artwork on the walls, decor is basic, they do nothing to make the guest feel welcome, etc. 

., mobile homes often lose value over time unless they are situated on owned land) and tenant turnover.However, tax advantages include depreciation deductions, which allow you to offset rental income by writing off the property's value over time, and cost segregation, which accelerates certain deductions.

You are losing money on both properties. 

If the deal goes south and you have next to zero money in the deal, selling a short sale or walking isn't as risky for you since you aren't losing much.

It's not only the money you'll lose, it's the time you spend (I figure worth $100 hr) and the mental anguish and stress.

By your own admission, you are losing money.

Meet the players. 

When you have a duplex and tenants on both sides stay for ten years, it almost guarantees that something isn't right.I would study your market and determine the value of your rental, because I bet you are losing money every month.