W. Charles Perry & Associates Home About Us Services Projects Personnel Clients Terms and Fees Contact Us Building Analysis, Design, and Renovation 1st American Plaza Building Swingstage Installation 1333 Broadway Swingstage Waterproofing Foster City Charter High School Foundation Woodlake Seismic Retrofit Laurie Meadows HOA Seismic Retrofit & Energy Efficiency Analysis Hillview Glen Apartment Renovation Simopoulos vs. Fiberwood Bay View Bank Seismic Retrofit 3166 26th Street HOA Beachpark HOA McArthur Heights HOA Southcliff HOA Sunnyvale Gardens HOA Woodlake HOA Stucco & Window Replacement Quanta Computers, Inc. Factory Remodel When OSHA changed window washing & unscheduled maintenance regulations for buildings taller than 75 feet, CB Richard Ellis needed to upgrade their roof-mounted building maintenance equipment.  We designed a swingstage installation.  When bids for the new system were too expensive, we requested a variance from OSHA, received it, and changed the design to a Controlled Descent Apparatus system. 520 S. El Camino Real, Suite 422, San Mateo, CA 94402-1726, voice 650-685-8290, FAX 650-685-8354 info@wcharlesperry.com