Carlyle bought The Crosspoint building on Liverpool Street from Alan Sugar’s Amsprop. : US private equity firm The Carlyle Group, which moved into London’s flexible office sector last year, has added The Crosspoint building to its portfolio. Carlyle has acquired the 41,000sqft nine-storey office building on Liverpool Street from Amsprop, a property company owned by British business magnate Alan Sugar. Carlyle said capital for this investment came from investment funds that it advises. No further financial details were disclosed.