I agree with the others that something closer to $100 is about right for having a plumber do this.Since you have a management company, you may not be able to do this, and/or you may prefer to pay someone to do this, but: if one or more of the people living in the property have relatively long hair, there's about an 80% chance that the problem is a wad of hair in the trap right under the drain.You need a screwdriver, a piece of #12 or #14 copper wire about two feet long, and maybe some needle-nose pliers. 

I've run into multiple areas of trouble, and I'm starting to see gray in my hair but not in my will.

It's not easy removing cast dander and hair.

Before that you're just running around with your hair on fire wondering why you ever got started!

I never thought about the beveled edges reducing chips but I did wonder about water as the bevels expose a hair of the core...but a little swelling there would not be as noticeable as on a square edge.

That I didn't look like my picture (sorry, but I was cleaning the unit all day and didn't wear make-up and had my hair in a ponytail). 

Another thought was to keep one of the units with the walls and just upfit it for a Salon and then rent out each room separately to hair dressers, nail business, massage business, tanning business, etc. 

@Troy FisherEvery two weeks we net a paycheck of $3,958 so bimonthly we make a hair under $8000 from base pay.

After pulling my hair out trying to figure out what to do in this situation on my own, I figured I'd reach out to a community of people who have been there and done that.

(Of course I have nothing against the hair dressers of the world).This may sound a little weird, but if someone told me I had to sit through 150 hours of RE training I think I might be a little excited.....