Depends on the landlord and how hard up they are to rent to someone. I personally wouldn't accept just a job offer letter.You will be just fine with an offer letter. Most places look for 3x income to rent. Ask your landlord if they would be willing to write a short letter explaining you were a great tenant. Mention your name, the type of job you do, and why you're interested in the apartment. This guide will cover how to write a cover letter for a rental application and even provide you with a rent letter example to help you get started. Your landlord may ask for an income verification letter or proof of income letter. Here's how to write that letter of employment for renting. The most common proof of income is your pay stub or an offer letter from an employer, selfemployed people have access to alternative proofs of income.