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Thayer Street
17,250 ft² office + 8,500 ft² retail
Façade retention along Marylebone Lane with demolition of the existing building.
Howard de Walden Estate
London

Seventh-floor extension with façade replacement.

Quantem advised on cost, programme and contract throughout delivery. Working alongside Mayfair Capital, the team set the financial and risk position from RIBA 0 through final account.

“A commercial office project of this scale demands forensic cost discipline from the first conversation. Quantem held the line through the whole programme.”

Façade retention along Marylebone Lane with demolition of the existing building.

Mixed-use refurbishment with five refurbished and two new floors.

Strip out with 9th-floor roof extension and atrium infill.

From RIBA 0 viability to final account — our partners are ready to take the call.