An employment agreement extension is a contract between an employer and employee that extends the term of the original contract agreements. Formally conclude agreements with our termination of agreement and release template.Prevent future disputes and ensure clarity for all parties involved. LETTER 5 - Temporary Contract – extension of temporary employment. (insert today's date here). To request a lease extension, submit a formal letter containing all the pertinent details your landlord needs to make a decision. City of San Antonio. The extension fee must be paid within 7 days of submittal before extension will apply. San Antonio, TX 78207. Offers of admission are valid only for the term indicated in the admittance letter.