Innovative Solutions For 50+ years

Early Years as Two Companies

In 1967, Kellermeyer Building Services began business primarily as a provider of cleaning services to department stores. In the 1970’s, the department store landscape became more competitive and Kellermeyer grew by providing cost savings through an outsourced model of cleaning. In 1984, Bergensons Property Services began as a family business that quickly started to gain regional traction in several states, focused primarily on pharmacy and supermarket chains along with Class A and B office buildings.

A System of Raising Standards — Lowering Costs

By the late 1990’s, Bergensons gained traction in these markets and saw an opportunity in the scale of national retail. Working with large retail chains, the company began to deploy a system of cleaning that raised the standards of quality for stores, while lowering costs. This system was applied across large scale operations, and Bergensons grew to service accounts in 28 states by 2005.

Growth and Merger

By 2010, Bergensons had tripled in size organically and in 2011, the company was acquired by private equity firm Kohlberg, which also owned Kellermeyer. Bergensons and Kellermeyer were subsequently merged, forming KBS. Mark Minasian, a co-founder of Bergensons became CEO of the new company. KBS became the largest provider of facilities services in North America through an integrated delivery model.

Investment in Technology and Leadership

In the next decade, KBS invested heavily in its management teams and began to diversify the business, growing into markets beyond retail. The company also invested heavily in technology, introducing KBSForce^TM, a web-enabled platform offering transparency and efficiency to the marketplace.

Key Acquisitions

In 2014, KBS was acquired by GI Partners, opening a new chapter of growth for the company. In 2017, KBS rapidly expanded by acquiring companies including Varsity Facility Services, Empire, Image, Pristine, Capital Contracts and Hospitality Staffing Solutions. In November of 2019, KBS was acquired by Cerberus Capital Management. By 2020, KBS had significantly expanded its national footprint, providing essential
facility services for clients across Retail, Logistics Support, Business and Industry, and Hospitality.

Responding To COVID-19 and a Changing Market

KBS’ scale, diversity, and operational reach positioned the company to respond quickly to clients’ needs during the COVID-19 pandemic. With a broad customer base, nationwide coverage, innovative technology, and an empowered workforce, KBS delivered more than 250,000 COVID-19 response services across the country, helping organizations maintain safe and operational environments during an unprecedented period of disruption

As the market continued to evolve following the pandemic, KBS expanded through the acquisitions of major facility service companies, including BRAVO! Building Services, Olympus Building Services, American Maintenance, and Kimco Facility Services. These investments strengthened KBS’ capabilities across regulated environments, industrial operations, and specialized service offerings.

Post-Pandemic Growth and the Next Chapter

In the years following the pandemic, KBS accelerated its technology strategy, establishing itself as a leader in robotics-enabled cleaning and data-informed operations in the facility services industry. This commitment strengthened operational consistency, scalability, and performance across complex client operating environments, including 47% of the Fortune 100.

In March 2024, KBS announced a major recapitalization led by blue chip investment firms KKR, Ares Management, and BlackRock, who are committed to the company’s long ‑term growth strategy. In August 2025, Mark Minasian transitioned from CEO to Chairman of the Board, and veteran services leader James Hyman was appointed CEO, marking the next phase of leadership and strategic direction for KBS.