Visit the southern end of the High Line, and you will see a dramatic transformation in progress next to the park. Construction is underway on the new High Line Headquarters and Whitney Museum of American Art. Last week, the first delivery of steel I-beams and columns arrived on the job site, and crews began erecting the frame of what will be the future home of maintenance and operations for the High Line.
Follow us after the jump for a construction update and a photo tour of the site.
Crews have made major progress since our last update  in February.
A few weeks ago, the construction workers completed the foundation work and began laying out a framework of steel rebar to support the first floor structural slab. Then, using a special crane, crews worked from west to east to pump concrete into the site. On the day of the pour, nine concrete trucks lined Washington Street just below the High Line to ensure that the work was seamlessly carried out. Once complete, workers troweled the concrete by hand to level the floor.
The crews have also moved forward with installation of the building’s steel frame. The arrival of steel is a big milestone in any construction project – this is the moment where you see the building structure beginning to take shape. At the High Line, the tight site constraints meant that crews had to unload steel directly into the building’s footprint. Columns and beams were then lifted into place and fastened to one another with large anchor bolts. The process began last week and moved quickly; by now the steel is in place for the majority of the building.
Another big change you will see at the job site is the installation of construction fencing on the High Line itself. The New York City Department of Buildings (DOB) requires the fencing to protect High Line visitors as construction continues on the building’s frame and facade. We saw the construction fence as a great opportunity for temporary signage, so we worked with our graphic design team at OCD  to create an illustrative map, a historical timeline, a seasonal calendar of free events and public programs at the park, and information about the design and construction of the High Line Headquarters. The fence also includes temporary signage educating visitors about the construction of the new Whitney Museum of American Art .
The next big milestone of the project is the arrival of the large roof girder. We can’t wait to see the girder set in place. This monumental piece of steel measures 100 feet long and 4 feet high, and it will travel by truck from Pennsylvania in the next couple of weeks. The girder is one of the signature design elements of the High Line Headquarters, designed by Renzo Piano Building Workshop in collaboration with Beyer Blinder Belle Architects & Planners.
Check out the photos below by Timothy Schenck , and stay tuned for another update soon.