For the 9th year in a row, Partner Engineering and Science, Inc. was named one of LA’s fastest-growing private companies of 2020 by the Los Angeles Business Journal!
Joe Derhake, CEO of Partner, says “What an honor to be recognized once again on this prestigious list, especially in such a challenging year.”
In 2007, Partner was founded in Los Angeles as a start-up with only eight employees. Today, Partner has 39 offices and over 950 employees in several countries.
While this list recognizes growth from 2017 to 2019, Partner is continuing to grow in 2020 despite the economic and real estate challenges from the pandemic. Since July 2020, Partner has hired 120 new employees.
Derhake said “We’ve grown every year of our company’s existence, recession or not. Investing in people is powerful if you take it seriously.”
The company’s incredible growth is largely attributed to Partner’s commitment to being the best home for talented professionals and the most trusted brand in the due diligence industry.
Our clients continue to trust our firm to support their projects due to Partner’s industry-leading talent. This year, Partner hired respected industry veteran Bob Barone who established due diligence and construction risk management practices for the CRE industry.
Partner also continues to grow our service offerings to fully support CRE properties for their entire life cycle. This year, Partner invested in roof consulting to provide services that will extend the lifespan of CRE roofs and preserve the warranty.
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June 22, 2026
Partner has named Frederick Ellington, AIA, LEED AP, as Technical Director in its Construction Services division. With 30+ years of experience, he strengthens the firm's construction risk management, due diligence, and project advisory capabilities for commercial real estate clients.

May 27, 2026
Capital planning in commercial real estate has entered a new phase. In addition to traditional lifecycle replacements, managers now face a growing set of capital needs driven by energy ordinances, decarbonization goals, and climate risk. These drivers are no longer peripheral considerations; they are central to how capital plans are developed, prioritized, and executed.

June 05, 2026
Partner Property Consultants, the European subsidiary of Partner Engineering & Science, Inc. (Partner ESI), announces that Antoine Yeprem joined the company in June 2026 as Senior Consultant, Real Estate Due Diligence, in Germany.




