Facebook has unveiled an enormous new office in Silicon Valley , which is large enough to hold a 9-acre park on its roof , and will house 2,800 workers in a single room . The new building in Menlo Park , California , measures 430,000 square feet and apparently has the 'largest open floor plan in the world ' . The social network 's newest location was revealed by founder Mark Zuckerberg , who posted an aerial view on the building on his public page . Scroll down for video . Park life : Facebook 's enormous new office in Menlo Park , California , was unveiled yesterday . Settling in : Facebook founder Mark Zuckerberg is pictured above having a meeting in an office-cum-ball pit , which was seemingly crammed with plastic playthings as a first-day prank . He wrote : 'Our goal was to create the perfect engineering space for our teams to work together . 'We wanted our space to create the same sense of community and connection among our teams that we try to enable with our services across the world . To do this , we designed the largest open floor plan in the world - a single room that fits thousands of people . ' Lush : The office features a 9-acre park on top of its 430,000 square feet of indoor space . California skies : The office is not far from Facebook 's current Silicon Valley campus - to which it is connected by tunnel . Relaxing : The waterfront office was documented by a small army of Instagram photographers ahead of opening day . Plans : This architect 's model of the office shows the single , long , open-plan room inside the office . As well as the huge open space , which has yet to be pictured , there will be smaller spaces for meetings . One Facebook employee posted an image of Zuckerberg and Facebook Chief Technology Officer Mike Schroepfer meeting in one room , which had been filled with plastic balls - seemingly a first-day prank . According to local news outlet The Almanac , 2,800 engineers will eventually work in the main , open room . They have reportedly not all been hired yet . Artsy : The warehouse has been crammed full of art pieces by Bay Area sculptors and painters , like the above . Trendy : The building will one day play host to 2,800 Facebook employees - but it is not yet at capacity . Construction on the new building , which is not far from Facebook 's existing campus , and will be connected via tunnel , was started in September 2014 . And despite the simple philosophy behind it , the new Facebook building still has plenty of capacity to impress . An army of Instagram stars was unleashed on the building , and captured its quirky stairways , unusual paintjobs and sculpture pieces made by Bay Area artists .
mark Zuckerberg posted about new premises in oak Park , California . 430,000sq ft office will mainly be one enormous room for offices . Said that the cavernous open space will be ' perfect engineering . '