First, if you are renting a residential property (which I assume your apartment is), then rent cannot be considered late until five days after it is due (technically, the sixth day of the month assuming it is due on the first). Second, the amount of the late fee might be excessive. Review some of the other posts on this site, however, a good rule of thumb is 6%, as that is the cap on residential mortgage late fees. If your rent is about $1,666 or more, then $100 might be a "reasonable" late fee. If your rent is less than that amount, it might be considered excessive. Also, late fee provisions must be in a written lease, or they may not be enforceable.

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