The landlord doesn't have to give any notice before withholding security but he has to let you know why he had not returned the full amount. In a standard lease a landlord can withhold security funds for any damage to the apartment, paint, plaster, carpet, etc., or failure to pay all rent. If the landlord doesn't let you know why he sent a partial return, then you can discuss this with a lawyer so you can get help with resolving this issue.
Answered on May 11th, 2012 at 9:49 AM