Slaughter and May is looking for a new headquarters to move into when the lease runs out on its main City building at 35 Basinghall Street in 2002.
It currently has four London buildings, but the leases on Basinghall Street and Austell House on Basinghall Avenue, both partly owned by the developer Wates, are due to expire in four years time, according to Jonathan Haw, executive partner in charge of premises.
The firm has a total of 205,000 sq ft across all four offices, but is looking for a new premises with about 250,000 sq ft of office space.
Haw said it had not yet been decided whether to keep 4 Coleman Street, which was only refitted for the firm last summer, or to relocate everyone to a single new site. Its other offices are at 16 Coleman Street and all four buildings are very close to each other.
He said the firm was looking at a number of premises, but he would not comment on a report in Estates Gazette, which said Slaughters was considering taking prelets on two premises: the publication cited as possibilities offices that developer Helical Bar is proposing to build on the City University site on Chiswell Street EC1; and Mitsubishi's prestigious redevelopment of Paternoster Square.