Keystone is a certified Women’s Business Enterprise, small business, and SSAE compliant firm with headquarters in suburban Ph ... iladelphia, Pennsylvania. Keystone is an innovator and leader within the real estate industry, leveraging its over 20 years of expertise, compliance, and infrastructure to generate supreme execution. Having managed $130 billion in real estate as a nationwide independent service provider, Keystone’s success is driven by implementing comprehensive solutions to drive best execution for client partners. Keystone specializes in real estate asset strategy, management, and valuation. Keystone’s corporate mission is to provide innovative, strategic solutions to clients, partners, and communities that extend beyond traditional real estate practices through: Quality of Service, Partnership Philosophies, and Innovation. CERTIFICATIONS National Women’s Business Enterprise Certified LEED® Green Building interiors certified SSAE 16 SOC I Type II compliant Philadelphia Business Journal Top 25 Woman Owned Business read more