X, Musk's social media company, is looking to give up a large chunk of office space at its San Francisco headquarters, which will further cut the company's footprint in the California city and deal a blow to the city's struggling real estate market. According to the San Francisco Chronicle, the social media company hired Jones Lang LaSalle to advertise about 460,000 square feet of office space at its headquarters on 1355 Market St. The company previously sought to sublease about 330,000 square feet of office space in the building next door.