Landlord (Brookline) now charging $13.5 for (small) load of laundry!

In a building with 9 units on Beacon St. One (kinda small) washer and dryer which is obviously not enough for the ~20+ people that live in the building, but that’s besides the main point.

Laundry was always expensive ($4.50 total) but last week the dryer broke and after fixing it, the landlord changed the price to $9 to wash and $4.50 to dry.

WTF?! Is this legal?