Lillangen High Cabinet with mirror front ($110.00)
Tyngen ($80) I used one that has been discontinued but this one is the same size
I bought a house that had a tiny master bathroom and I expanded it by taking 3 feet from the next bedroom. In doing so, I needed storage space and also a space to anchor my new quartz counter top to create a vanity. It had to be narrow but deep. I had about 12 inches in width to work with. I looked for something but my only option was to have something custom made. My only option until I went to IKEA.
My daughter and I put the two units together and they were positioned with one facing the toilet against the wall and the mirrored front unit backed to the side of the back open unit. This provided the narrow width I needed also with the depth. They were not the same height but my construction guy attached the shorter (back unit) to the mirrored unit. He covered the side and back with beadboard and trim and on the vanity side, it looked like one unit. On the back side there was open shelves and a lower cabinet. It is perfect.
On the right side of the picture the mirrored front of cabinet reflecting bathtub.