North Hills Office Services, Inc. is a full service building maintenance contractor servicing the Metropolitan New York area ... for over 47 years. North Hills was founded with the intent of providing quality janitorial services at the lowest possible cost for its clients. North Hills Office Services has one goal, to form a partnership with its clients and become part of their team in the area of janitorial and facility maintenance. • 24 hours, 7 Days a Week, 365 Days a Year • Over 400 Supervised Staff • Cleaned 8,000,000 square feet and counting! • Fully Equipped, Bonded & Insured read more