The Conco Companies are providing concrete services for a new office building in downtown San Francisco located at 350 Bush Street. The new 20-story high-rise will have 18 floors of office space, one lobby level, and a roof terrace as well as a two-level subgrade parking structure. In addition as the office tower will incorporate the San Francisco Mining Exchange, a historic landmark, as its primary entrance, the project also includes the “Historic Renovation of San Francisco Mining Exchange Building.”

350 Bush - The Conco Companies

The client on the project is the Lincoln Property Company and Hathaway Dinwiddie is serving as the general contractor. The project was designed by the architectural firm of Heller Manus Architects and integrates the terra cotta façade and the columns of the landmark building with the office tower. The plan calls for a grand lobby in the historic exchange hall as well as a galleria at the street level. Once complete, the project will include 469,000 square feet of new and renovated space and will be a balance of antique and modern. The building is seeking LEED Platinum certification and will feature a number of environmentally advanced technologies.

The Mining Exchange building was constructed in 1923 and for a short time was used as the Stock Exchange. It was designed by Miller & Pflueger, an architectural firm that designed a number of significant S.F. buildings of the time and closely resembles the New York Stock Exchange that had been constructed twenty years earlier.

Through the years, the building was used for the San Francisco Curb Exchange from 1928-1938, the San Francisco Chamber of Commerce from 1938-1967, and finally the Western Title Insurance from 1967-1979. It has sat empty since 1979.

350 Bush - Concrete Reinforcement
350 Bush - Rebar Fabrication

Conco’s mission is to be the best supplier of concrete services in the Western United States and to bring experience, expertise and quality to each project.  We continue to upgrade and expand facilities to better serve the growing market for public works projects, commercial, educational, parking structures, and other construction development.


The Conco Companies is providing concrete services for The Mark, a 48-story high-rise tower in Seattle, WA that will consist of 528,000 sq. ft. of Class A+ office space, as well as a luxurious 189-room SLS hotel and spa. Conveniently located in the city’s central business district, the stunning beautifully designed tower will incorporate a wide range of “green” building features such as rain water management, photovoltaic glass and light pollution reduction. Scheduled for completion in April, 2017, the tower will bring to the area first-class office space that is highly divisible and offers 9’ 6” windows for natural light and spectacular views.

Concrete Pumping - The Mark

The 5,000 cubic yard mat foundation pour was completed in June, 2015 and required approximately 500 truckloads of concrete over the course of the day. The project also includes a sub-level parking structure comprised of shotcrete perimeter walls and a concrete elevator core. As of May 2016, Levels 5-11 decks have been poured and the core poured to Level 35. When the elevator core reaches Level 35, the remainder of the building steel will be erected in one continuous phase.

The building’s unique geometric facade provides exterior seismic bracing for structural safety as well as column-free floor plates. Unobstructed by columns or bracing, the 13’ 6” floor-to-floor heights will allow for individualized, open plans or heavy build-outs. The Mark is seeking LEED Gold Certification.  

The SLS hotel will be a collaborative effort from the Founder and CEO Sam Nazarian, renowned designer Philippe Starck, and chef James Beard. The hotel will also include 15,000 sq. ft. of meeting space, a 5,000 sq. ft. ballroom, sky lounge and two restaurants. Adjacent to the SLS Hotel are two historic buildings. A century-old sanctuary building, the First United Methodist Church, and the Rainier Club. Founded in 1888, the Rainer Club has occupied their current building since 1904.

Additional information is available at http://www.themarkseattle.com/.

The Conco Companies - The Mark
5th & Columbia Washington Concrete

The Conco Companies is one of the foremost suppliers of concrete services for the Western U.S. We began operations in 1959 in the Bay Area by offering clients the best value on a broad range of concrete services and products. Since that time, we have taken a leading role as top concrete contractors in the region. We have four regional offices serving California, Oregon, Nevada, Colorado and Washington.


Conco Companies CPMC:Sutter Van Ness Medical Office Building

The Conco Companies, along with Charles Pankow Builders, Ltd. were awarded the contract for the 250,000 square-foot Van Ness Medical Office Building currently under development. The project was designed by Boulder Associates architectural firm and is targeting LEED Silver certification. Construction on the project began in 2015 and the building is expected to open in late 2018.

Located on the California Pacific Medical Center (CPMC) Cathedral Hill campus, the $168 million project will consist of nine stories above grade, street level retail and six levels of below-grade parking for 383 cars. The project’s design elements include four green roof gardens that will provide the Van Ness Medical building with 25,000 square feet of green space. During the course of the project Conco will use approximately 4,500,000 lbs. of reinforcing steel.

Using a Lean Construction delivery process, Conco, in conjunction with Pankow, is utilizing 3D BIM (Building Information Modeling) programs to improve efficiency by coordinating all design disciplines and minimizing constructability issues.  The project is 100 % modeled in our state of the art Tekla 3D Model program.  This is the first of three projects from the Office of Statewide Health Planning and Development (OSHPD) to utilize a Lean Construction delivery process.

Once the building opens, it will house physician offices and ambulatory medical care. Although already half of the center is pre-leased by CPMC and Sutter Pacific Medical Foundation, there will also be space available for private physicians. Furthermore, to ensure convenient access to the new 700,000-square-foot acute-care hospital under construction across the street, a pedestrian tunnel is planned for underneath Van Ness Avenue.  

The Conco Companies is one of the leading concrete contractors in the Western U.S. and offer a wide range of quality services and products. Our experience includes providing services for commercial, educational, parking and other construction development as well as public works projects. We serve California, Washington State, Oregon, Colorado and Nevada.

Conco Companies CPMC:Sutter Van Ness Medical Office Building
Conco Companies CPMC:Sutter Van Ness Medical Office Building 4
Conco Companies CPMC:Sutter Van Ness Medical Office Building 3
CPMC/Van Ness Medical Office Building Update April 2017 - The Conco Companies
Van Ness Medical Office Building Update April 2017 - The Conco Companies 5
Van Ness Medical Office Building Update April 2017 - The Conco Companies 4
Van Ness Medical Office Building Update April 2017 - The Conco Companies 3
Van Ness Medical Office Building Update April 2017 - The Conco Companies 2

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