Rugs Required in Lease - Valid?

[Daniel Kramer]

My sister asked me to review her lease. She lives in Boston and this is an older 5-unit with hardwood floors. There is a note that requires her to cover approximately 80% of the hardwood floors. I understand the desire for that as a landlord, but is that really enforceable? I mean if she signs it, then I would guess it is. I'm tempted to advise her to give the landlord a call and say everything is great, can't wait, but can we strike this clause from the lease.