1 Old Park Lane
The conversion of this Mayfair bank headquarters overlooking Green Park to high-end retail and luxury apartments was one of a number of projects successfully completed with client RBS and architects Squire and Partners. Originally constructed in 1905 and clad in ornate Portland stone, the building represents one of the earliest uses of a structural steelwork frame in London.
Changes in the servicing strategy to the building, the desire to increase floor area and the need to rationalise each of the floor plates called for significant structural intervention. New and enlarged services risers resulted in substantial remodelling of the existing filler joist floor structures adjacent to the retained central stair core, with the introduction of new trimming steelwork and new infill slabs.
The full-height removal of the substantial chimney breast, whilst still retaining the 4 m-high stack above the line of the roof, required a structural approach that was simple to build and was not dependent upon costly temporary works.
Two new steel beams, spanning 8 m between points of existing support and spliced in three sections to simplify erection, were installed within the roof space through punched holes in the existing stack. Inexpensive precast lintels were then utilised as needles to transfer the self-weight of the stack to the new support beams in a hit-and-miss sequence. Once the new support system was in place and the transfer of loads complete, the demolition of the breast below could commence.
The classic stone exterior of the original building and the modern, clean-cut design of the interior combine to make 1 Old Park Lane a sought-after development.
Luxury conversion of an historic Mayfair building into high-end retail and residential units
Royal Bank of Scotland
Squire and Partners
£ 4 million