They even complain about hearing toilets flush and cabinets closing. 

I'm with J Scott... if you're in a target rich market, keep flushing your money through as quickly as possible... if you're in a more arid environment maximize the potential from each deal you do find to maximize your total profit.

If in doubt, replace the fill and flush valves on all the toilets ($15 worth of parts each, and less than 15 minutes each to change).

There seems to always be that stuff you don't notice until some one is living in there every day.For example, while I am at the house, before its rented, I run all the sinks, tubs, showers, and flush the toilet with toilet paper a bunch.

gorilla platform ladder/station.Toiletbuckets to drain water that's left in bowl after flushing and shutting off water. 

Or should I replace them with high efficiency or the two flush option toilet (I think those are so cool for some reason)?

Measure your own blinds, count up your privacy/passage, your knobs/pulls for cabinets, toilets, main ceiling (is it a flush or a drop down?

Anyone considering in investing in Binghamton, NY and surrounding municipalities needs to read this article.www.pressconnects.com/story/news/local/watchdog/2018/01/04/flushing-millions-down-toilet-broome-sewer-plant-rebuild-cost-projection-tripled-275-million/960700001/

you talking mixed use in a ( just speculating small mid western town)  the mid west is littered with vacant commercial buildings.habitation for humans is one thing most folks need a roof.. but not everyone needs a small commercial space.not to mention tough to finance.. as for timing its neither good nor bad.when it was good NO one was buying except the very brave and the foriegners with cash.. credit was frozen or US folks were reeling.so now that cash is flush everyone is back in the game.. so there ya go.

This will flush a few out and I can make the updates then.