You know who has a great-looking 'farm style' bath sink for a ridiculously low price? IKEA. Think it's only $150 or so... One downside to that style is that there's virtually no countertop left. But for a powder room, that might be OK, or even preferable.

Thank you for the information. Obviously there some things I didn't consider here, like the fire walls. Yes, by "unit" I do mean my condo above the garage. Each building contains four condos. The buildings are situated such that the private garages are on the ground floor. All garages are separated with walls between them, have separate (private) garage doors, and have no direct access to the condo above them. Above the garages are one story condos. Below my condo is my garage and my upstairs neighbors garage. Above my condo is another condo. So building is three stories, garages on first floor, two condos above garages on second floor, and two condos on the third floor. The plumbing is a bit of a mess. Everyone has a separate water heater in the garage, this is where I would get my hot and cold supply. I do have have supply and drainage lines that penetrate my garage walls and ceiling. Best I can tell, the builder basically split the buildings drainage in half, so that the water from my condo's master bath, kitchen, and laundry and my upstairs neighbors master bath, kitchen, and laundry drain straight down through pipes in my neighbors garage. And the water from my second bath and my upstairs neighbors second bath drain straight down through pipes in my garage. Hope all that makes sense - I'll post a pic of this when I get home. So, with that said, and assuming that a water closet is a reference to a toilet, on this waste line I am referring to, there would be two toilets, two wash basins, and two shower/tubs (half being in my condo and half in my upstairs neighbors condo). With all that said, as well as what I gather from the above posts, supply isn't an issue, but possibly waste is. The purpose of the sink would be occasional hand washing, so exceeding the line shouldn't be a concern. The only concern would then be the vent if I'm understanding correctly. So because this sink would be installed at a level lower than the lowest toilet, it would need to be vented separately? I would have thought that taping into an existing waste line that is vented would suffice. Does this serve a practical purpose, or is this so that it is up to code?

I don't think a utility sink is a necessity, but it is convenient when you need one. Our last house had one in the laundry room. We had babies and young children then, so I was soaking a lot of clothes in there;) I used it for the mop and to clean up after painting. It was conveniently located right next to the washer. I took the sink out of the laundry room here to make more room for hooks and benches and gear. There is a utility sink in the workshop in the basement, and I haven't used it much, but I am glad it is there. Cleaning up after painting outside is a great idea and I have seen that done, but I live in WI, so that is only possible for half the year.

I have the same issue of exposed plumbing. So I do not know what my options are besides for a cabinet. I have a porcelain utility sink that I am hoping I could use somehow.