The Arch Company is to invest £200m to bring 1,000 derelict and empty railway arches back into use.
The Blackstone-backed landlord, which bought more than 5,000 railway arch properties from Network Rail in 2019 for £1.5bn, wants to complete the investment drive by 2030.
The joint venture between Blackstone and Telereal Trillium had said previously that it would bring 600 premises back into use. However, since then it has identified the potential to revamp a further 400 premises.
The investment will include renovation work across England and Wales, including significant works in London, Manchester, Windsor and Leeds.
Of the £200m, £13.5m has already been spent renovating empty premises.