Part-Time Bookkeeper / Office Assistant. Join the Team at Party Line Rentals & Westchester Tool Rentals – Elmsford, NY. Are you a highly organized individual with bookkeeping experience and a knack for keeping an office running smoothly. Party Line Rentals and Westchester Tool Rentals are seeking a. part-time Bookkeeper / Office Assistant. to support our growing businesses. If you're detail-oriented, dependable, and enjoy a variety of tasks, we’d...