Generally a job offer letter will show your new salary and that will help that you will be financially able to pay rent. And if they refuse at first, they will often accept if you offer to pay the first few months of rent in advance.Mention your name, the type of job you do, and why you're interested in the apartment. Is using a job offer letter for proof of income to rent an apartment illegal if i have no i Intention of taking the job? Looking for a renter cover letter to get your rental application noticed? Here's what to include as well as a downloadable letter. Provide verification of the income that has increased. Learn how to write a proof of income letter with our stepbystep guide and use our fillintheblanks template as an example. Explore one of Santa Clara's 38 parks, totaling close to 450 acres. The California Apartment Association is the nation's largest statewide organization representing the rental housing industry.