Your letter of employment should not be an afterthought but recent and "the centerpiece of your application," Franklin says. In the case of new employment, applicant must present a signed offer letter on company letterhead stating income.You need a letter of employment to get an apartment so that you can prove to the landlord that you are employed. Depends on the landlord and how hard up they are to rent to someone. I personally wouldn't accept just a job offer letter. Here are the mistakes first-time renters need to avoid, like missing paperwork, insufficient funds, and no credit history. Signed offer letter. If you've been offered a new job, providing documentation of your new employment can also serve as proof of income. Mention your name, the type of job you do, and why you're interested in the apartment. The Mitchell-Lama program provides affordable rental and cooperative housing to moderate- and middle-income families.