Largo topped-out at the 1066 Market street high-rise this week in downtown San Francisco. The building features two levels of below grade parking with 97 total stalls and 4,000sf of retail at grade level. 303 high-end residential units span the following 15 levels above grade. Largo is working with general contractor Swinerton Builders, architect Solomon Cordwell Buenz & Assoc. and structural engineer Nishkian Menninger to have the building open in early 2020.
The American Concrete Institute’s Southern California Chapter has selected the Disney Frontierland Expansion and the Circa projects for the annual Pankow awards!
Charles Pankow Jr. Award – Circa at 1200 S. Figueroa
The focal point of this $500 million mega-project are the twin high-rises adjacent to the Staples Center in downtown Los Angeles. 26 residential levels sit atop eight levels of podium parking, two of which are below grade, with commercial space at grade level. Designed by architects Harley Ellis Devereaux both towers stand 420’ and hold 648 total units. The 2-acre amenity deck complete with swimming pool and fitness center is located on the podium level above 1,645 stalls of parking. Situated between LA Live, the Convention Center and the Metro Pico Station in the city’s South Park district, the high-rise buildings feature an elliptical north face to enhance views of the skyline and mimic design themes from surrounding architecture.
Structural engineer Cary Kopczynski & Company utilized cast-in-place concrete with post-tensioned slabs which minimizes internal columns for maximum openness. The use of a two-way post-tensioned slab system allowed for continuity of framing between the retail/parking podium and the residential levels above, eliminating the need for transfer beams. A combination of shear walls and ductile frames resist seismic loads.
In June 2015, Largo started by pouring four large mat foundations totaling 15,985CY with ready mix supplier Holliday Rock. Over the course of 24 months Largo poured a total of 110,000 cubic yards installed by 600,000 man-hours without any days away from work safety incidents. All this was all accomplished across the street from the home court/rink of multiple professional sports teams and millions of convention center guests.
Outstanding Performance in Design and Engineering Award – Disney Frontierland Expansion
The goal of this project was to prepare the Disneyland park for the new Star Wars attraction. In addition to four tunnels, multiple retaining walls and a marina, Largo’s scope included a concrete trestle bridge for the railroad at the Rivers of America attraction. Although the visual aspect of the end product is exquisite, the details that were put into the fabrication of the two elements of the structure; the columns and hammerheads, and the concrete mix design used to simulate an aged wooden railroad trestle bridge, is also noteworthy.
The columns started in the back lots of Walt Disney Imagineering as an image in the mind of the design team. This image was transformed into approximately 50 lineal feet of hand carved foam positive. This was reviewed by the Disney team to confirm their vision and sent out to Fitzgerald Formliners to confirm that the positive would produce a usable form liner. A number of changes were made in the foam positive to ensure that no negative spaces existed in the positive to allow for smooth removal of the form liner. To allow for proper alignment of the four columns that attached to each of the twelve hammerheads, relative to each other, the column forms were fastened to a wall form.
With all of the details in the form liner, Largo contacted Holliday to discuss the appropriate concrete mix design to ensure a perfect positive from the very detailed form liner. Although self-consolidating concrete is not frequently used in the Southern California Market, it was determined that with the details, the importance of exact alignment of the columns and the limited space within the column form to allow for a vibrator, that this would be the appropriate mix design to yield the best finished product.
4000 psi @ 28 days Self Consolidating Concrete mix with a water to cement ratio of 0.44. The cementitious content was 8.5 sacks that was 70% Type II/V cement and 30% Type F Fly Ash. Nominal spread was 25” to 30” but it was usually in excess of 27”. It has a maximum aggregate size of 3/8”, but since the mix needed to reveal very fine details it was proportioned to contain 70% Washed Concrete Sand. All of the aggregates are from Holliday Rocks Upland California Facilities. The admixtures in the mix design included: a Type F High Range Water Reducing Superplastizing polycarboxylate, a workability-retaining admixture that provides flexible degrees of slump retention without retardation. And when needed (in this case it wasn’t but was always available) a viscosity-modifying admixture that is specially developed for producing concrete with enhanced viscosity and controlled rheological properties that increases resistance to segregation while facilitating placement and consolidation.
The hammerheads that span across the columns were formed out of rough sawn dimensional lumber of varying widths on top of the above-mentioned columns. Each of the twelve hammerheads were formed with no common joint plan of the rough sawn lumber. Steps were taken to raise the texture of the rough sawn lumber. Each board was soaked in water overnight and sealed with form release to accentuate the rough sawn look to the vision of the Imagineers. The hammerheads were also poured with the self-consolidating concrete mix design that was used in the columns.
Typically, these decorative types of concrete elements are a post installed façade covering a structural column, but with the load requirements of the train, envisioned size of the elements and the environmental concerns of the river, the above summarized use of concrete was developed and put to use.
The Market street development will hold 303 units and 97 parking stalls spread across 3 levels below grade and 16 levels above. Working with general contractor Swinerton Builders, Solomon Cordwell Buenz architects and Nishkian Menninger structural engineers, Largo expects to top our during the summer of 2019.
A couple miles north, the 875 California development is also being constructed with the same general contractor and structural engineer, with BDE Architecture. The building will house 44 units above 48 parking stalls on 100,000gsf. The structure will be 2 levels below grade and 8 levels above and is expected to top out during the summer of 2019.
Across the street from Pershing Square, Largo topped out at the Park 5th development in downtown Los Angeles this week. The building rests on a 4,700CY mat foundation which was poured in August 2017, with two levels below grade and 25 levels above. Patrons of the 347 unit high-rise will enjoy a rooftop deck with a club room, fitness center, a bar/kitchen, TVs, a business center, and an infinity pool with cabanas. Designed by architect Ankrom Moisan and Nabih Youssef & Associates structural engineers, the buildings is seeking LEED Silver certification by the USGBC. Working with general contractor Suffolk Construction the building is scheduled to be open in the first quarter of 2019.
437 S. Hill Podium
The MacFarlane Partners are also developing the site adjacent to the high-rise into a new mid-rise apartment complex. Largo worked with Bernards on this project pouring the concrete in a 5 level parking podium with wood frame above.
Largo poured 9,509CY of concrete at the Century Plaza Residences in Century City this weekend. The large foundation is for one of two 46 level residential buildings with a similar size pour scheduled for later this summer. Over 100 tradesmen were on site to unload, pump, place and finish 1,001 ready mix truck loads over 16 hours. Seven boom pumps, two city pumps and two placing booms worked together pumping 800CY/Hour. Working with architectural premiere designers Gensler, Pei Cobb Freed & Partners, Harley Ellis Devereaux, Englekirk Structural Engineers, and general contractor Webcor Builders, the development is scheduled to open in 2020.
UAV Footage of a mini mat pour at the Station 1300 project in Menlo Park, CA.
Located in downtown LA’s historic core, the 732 Spring Street high-rise topped out this week with the Holland Partner Group. The tower stands 24 stories above grade with two additional levels of subterranean parking and retail on the ground floor. 300 residential units are spread across the upper 20 levels sitting above 430 parking stalls across the lower levels. The architecture blends a historic base with contemporary design with distinguished vertical elements alongside an all-glass facade. The building is designed by MVE Architects and Glotman Simpson Structural Engineers and is scheduled to open during the summer of 2018.
Located between downtown’s Historic Core and the Fashion District, this 32 level residential building is on the north corner of West 8th and Spring Street. Designed by MVE Architects and Glotman Simpson Structural Engineers, the building features 275 residential units across 19 levels and 612 parking stalls across 9 of the lower levels. The building façade incorporates the old with the new and features parapet walls and defined vertical elements from the ground floor to level 19 where an all-glass skin continues the rest of the way up. The amenities deck on level 7 includes a pool, spa, barbecues, outdoor lounges, a fitness room and a common area with additional public viewing area on the roof deck. Working with general contractor Holland Partner Group the development is scheduled to open during the summer of 2018.
Largo placed 4,700CY of concrete at the Park 5th Development in downtown Los Angeles right across from Pershing Square over the weekend. The large foundation sits at the based of a 25 story residential high-rise building scheduled to open early 2019. Working with architect Ankrom Moisan, Nabih Youssef & Associates structural engineers and general contractor Suffolk Construction, Largo anticipates topping out in August of 2018.
One block west of the Miracle Mile in Los Angeles, Largo recently topped-out on a high-rise residential tower on the corner of Wilshire and Crescent Heights Blvd. Working with Matt Construction the high-rise building consists of 20 levels above grade and 3 levels below for a total of 393,137gsf. The building is designed by Steinberg Architects and Nabih Youssef Structural Engineers and features 150 apartment units, 7 levels of parking providing 411 stalls and a rooftop terrace complete with lounge, swimming pool, fire pit and a hot tub. Typical levels provide 10’6″ floor-to-floor heights while the level 17 penthouse and 18 skydeck are 14′ and 18′ respectively. The project also includes 6,000sf of retail space on the ground floor, a open space terrace at the back of the development and two levels of structural steel at the top housing MEP support facilities.