For commercial tenancies, late fees are valid unless they are unreasonable. Liquidated damages limitations are for residential tenancies. The only way to really find out if your late fee is unreasonable is if a judge rules it to be so.
While you may have waived your right to recover the late fee by never demanding it, you can send a letter to the tenant to request the late fees be paid.
Answered on Dec 06th, 2015 at 8:55 AM