This would go for about $400.The backsplash on the right is much higher and has four insets, a flush switch and an outlet to raise and cut around, marble pencil, marble chair, marble square trim.

Now I have 10 items on hand that I have to return the next day when I get another job regarding the toilet leak .. is it the flush, the valve, the supply line, the wax, the bolt and washer holing the tank, or is the leak from the shower and not the toilet at all?.. 

If the plumber dictates that it is because of things being flushed then you can warn the tenants with that and possibly charge if you want to.

The industry is flush with easy vanilla refi business, the only folks taking reno business right now are the ones coming from a place of desperation.

I've done this for 7+ years, and the worst problem is someone used the toilet and didn't flush.  

I have these in my home as well as rentals, never ever needs a 2nd flush.

Sanitary FacilitiesThe bathroom must be located in a private room within the residence.The bathroom must contain a flushing toilet, a shower or tub and a sink.The shower or tub and the sink must have functioning hot and cold water.2.

Water heater was old and developed a sulfur smell in hot water...affected shower and laundry.Replaced water heater (new).Tenant complained that water still smelled bad, so had her flush the bathroom, kitchen and washing machine lines to get rid of any bad water remaining in pipes.I sent her a $50 gift card for her trouble ( which she didn’t acknowledge until I asked if she’d received it.)Now she’s complaining that her towels and husband’s work clothes stink when wet even though they don’t smell bad when dry.This is a SFR in a fairly nice area in Midtown...I believe she’s hinting at free rent ($1288-) for a month or more.Should I even consider that?

Of course guests flushing god knows what down the toilets may cause issues  but not much you can do to stop that.

Make sure you fully flush all the toilets empty.