Realize several have already suggested having a janitor's sink. As luck had it I watched HGTV for the first time in a long time today. The programs which got my interest were the the reuse of older buildings, such as fire houses, schools, churches, etc. One restoration turned the janitor's closet into the master bedroom's bathroom. A toilet and bath tub were added, but the lady owner wanted to retain the janitor's sink in keeping with the history of the building. She turned it into the bathroom sink by raising it to a convenient height.
'I thought' it was a pretty clever idea. The basin probably holds 25 gallons of water, is fairly deep; her glazed-china sink had a metal protective plate built into the outer lip, an integral back splash, and probably occupied about the same floor space as a regular hand basin or parts washer.
Just a thought!