From the site;

Marshall & Swift / Boeckh (MS/B) is a leading supplier of local building cost information, residential and commercial property valuation technology and services for the property and casualty insurance sector in the United States and Canada. MS/B has six offices throughout the U.S. and Canada.

In June, 2001 Marshall & Swift, E.H. Boeckh, and Digital Documentation Systems joined to form Marshall & Swift / Boeckh (MS/B). With the consolidation of the strengths and services of three companies, MS/B now offers the largest knowledge base in property estimating for the property and casualty insurance industry.

Corporate Office; Appraiser and Assessor Products and Services
915 Wilshire Blvd.
Suite 800
Los Angeles, CA 90017

(800) 421-8042
(213) 683-9000
Fax: (213) 683-9010