That is odd. I would not recommend buying a 3 family with 2 bathrooms. It may have been zoned a 3 family but was converted to a two and remodelled or something, but a 3 family with 2 bathrooms is a funny thought.
It could also be a misprint.
I have seen this house a few times. I live not too far from it. The city has it as Use: 1-Family Residence Style: Condo-Apt currently listed as two 1 bdrs and one 3 bdrs. Were you looking for a multi in quincy?? the best way would be for you to go in and take a look at the house; if you would like to do so contact me and I will arrange it for you.