How To Write A Letter To Landlord About Security Seposit . I am including your entire security deposit along with this letter. Landlord’s letter returning security deposit &.property or owes rent, a landlord can use the security deposit to cover those expenses. Get Our Example of Security Deposit Demand Letter Template for Free from www.pinterest.com Request letter format to landlord for refund of security deposit. How much you paid for a security deposit; I am writing this letter to request you to kindly refund the security deposit that you had taken for the apartment located at b 403, ridhi sidhi apartments, sarojini nagar, new delhi.