"Τhe facility could be 50 feet away or it could be a 5 mile walk"
Realtor associations at least in the Netherlands have guidelines (e.g. on what distances amounts to 'walkable') that prevent this sort of thing, I see no reaons our country would be unique; that said, do you have any specific examples of ads like this? It's not that I'm that fond of realtors, but some of the over the top claims in this thread are really exaggerations. Will you find examples of exaggerated claims? Of course. The question is, is it 'common'? I'd say no.