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Developer Trammell Crow broke ground April 10, 2014 on the all-union, CleanTech Manufacturing Center, creating more than 350 prevailing wage construction jobs for members of the trades unions in Los Angeles. The project, on 20 acres just southeast of downtown Los Angeles (situated within a half-mile of Interstates 5 and 10, as well as the 60 Freeway), started preliminary work in October of last year. The three-building campus offers the largest contiguous industrial space downtown.

Oltmans Construction Co. began construction of CleanTech’s three (3) new concrete tilt-up buildings on July 1, 2013. Originally a brownfield site, the site and buildings have been transformed into a LEED Silver certified sustainable project. The manufacturing center is located in a new section of the city being established for “green” businesses. The center’s three facilities occupy 227,000 (Building A), 102,000 (Building B), and 28,000 (Building C) square feet respectively.

“This project has been a long, long time coming,” said Trammell Crow Construction’s Senior Managing Director Brad Cox. “This property has sat fallow and destitute for over 35 years.” At one point, it was slated to become a state prison.


Fashion manufacturer Ambiance USA has relocated and expanded its world headquarters at the new facility. They have leased two of the largest buildings on campus.


“CleanTech Brings 350 Union Jobs,” announced the Building Trades News magazine’s May 2014 publication.

As part of the Los Angeles County’s Community Redevelopment Project Areas, primary requirements for this project included coordination with the Community Redevelopment Agency (CRA) to develop a Project Labor Agreement (PLA) in conjunction with the Building & Construction Trades Council. We also collaborated with a third-party Jobs Coordinator to exclusively hire unionized subcontractors with an emphasis on local workers. Oltmans was able to seamlessly represent the client and coordinate with the CRA to create a complete PLA with sections specific to: the exclusive hire of unionized tradesmen, priority selection of local subcontractors, trades people and apprentices through a Jobs Coordinator, and observation of union codes and regulations. All subcontractors and trades people thereafter, hired by Oltmans, were also required to agree to uphold the PLA by notifying the Building and Construction Trades Council prior to employment. The intended use of the PLA is to ensure that all parties remain committed to the residents and city of Los Angeles and to ensure that the project will proceed without interruption.


LEED Silver certified.


Building A – At 226,970 square-feet, Building A is the largest of the three buildings and houses Ambiance USA, fashion manufacturer. It sits on a 466,663-square-foot site. The manufacturing facility includes 39 dock loading positions, 32’ clear height, 45’ building height and 197 parking stalls.

Building B – The single story, 101,890 square foot facility sits on a 235,877 square foot lot and includes 11 dock loading positions, 32’ clear height, 42’-6” building height, and 114 parking stalls.

Building C – Building C is a two-story facility with 23,710 square feet on the first floor and 4,650 square feet on the second floor. It includes 30’ clear height, 40’ building height, and 48 parking stalls.


Due to its past as a Brownfield site, the soil on the site reported levels of hazardous materials. Oltmans played a large role during preconstruction to coordinate the design and to expedite the installation of mitigation systems prior to the start of construction, therefore, reducing construction duration. During demolition we also discovered high levels of contaminated soils. Due to time-frame sensitivity, we were able to coordinate with the owner and the city of Los Angeles’ remediation contractor to stage the soil so that we could continue the construction while the soil was properly disposed of. After the contaminated soil was treated, and removed, a methane vapor extraction system was installed to actively pump, monitor, and extract any residual vapor that may permeate through the soil.

Potholing was another aspect of preconstruction that was required of the site; this included investigating any unknown contents above and below ground and removing any debris that was found prior to construction.

Total Square Footage 339,000 s.f.

Building A 227,000 s.f.

Building B 102,000 s.f.

Building C 24,000 s.f.