Generally a job offer letter will show your new salary and that will help that you will be financially able to pay rent. You need a letter of employment to get an apartment so that you can prove to the landlord that you are employed.By signing below, I (we) authorize the Landlord to make the above requested changes to the Lease. In addition, I (we) understand. Is it illegal to rescind a job offer under New Jersey employment law? The answer is that sometimes, under certain conditions, it certainly can be. Learn the key elements of a successful apartment offer letter, including job details, rental history, and ways to stand out to landlords. We can provide you with guidance on how to fill out forms. We can usually answer questions about court deadlines. You need a letter of employment to get an apartment so that you can prove to the landlord that you are employed.