Applicants for Staff and Administrator positions are required to submit a letter of interest. Pima County Employment Application.Please read this information before completing the application. If you don't have a specific contact to address your letter, it is okay to use a general address. Generally a job offer letter will show your new salary and that will help that you will be financially able to pay rent. A security deposit is a sum of money that a landlord is permitted to charge a tenant at the beginning of a lease or rental agreement. Instructions on how to do so are included in the application. Be sure to save this number. Please note: this step is a pre-application only. Acceptance letter or shortly after.