Here's everything you need to know about not returning security deposits, including a security deposit refund letter template. The letter should state whether the deposit is being returned in full, partially returned, or not returned at all.Learn the basics of how to write a security deposit letter to a tenant. Re: Return of security deposit. Document everything, understand the rules around "wear and tear" and know your rights if your landlord refuses to return your money. If the building is sold, the landlord must transfer all security deposits to the new owner within five days, or return the security deposits to the tenants. Check out our demand letter tool. Below is a sample New York security deposit demand letter, asking a landlord to return a security deposit. Edit, sign, and share Letter from Tenant to Landlord containing Notice of failure to return security deposit and demand for return - New York online. You are now over a week late returning my deposit.