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Mansfield Street runs between New Cavendish Street and Queen Anne Street in Marylebone, and is one of the most architecturally coherent Adam-period streets in central London. Postcoded W1G, it falls within the Howard de Walden Estate and was developed between 1770 and 1775 after Robert and James Adam leased a parcel of land from the 2nd Duke of Portland in 1769.
The site had an earlier history: before the Adam development, it occupied the location of the Marylebone Basin, a reservoir built by the York Buildings Company in 1725 to supply water to the Cavendish-Harley estate. The Adam brothers cleared this and built ten four-storey speculative terraced houses in stock brick, relatively restrained on the exterior but with interior decoration supplied by Robert Adam himself, including ceilings, chimneypieces, and wall ornamentation. The doorways are flanked by Ionic columns with fanlights above, giving each house a quiet but precise formality.
The quality of the surviving fabric is significant: numbers 5 to 13 and 16 to 22 are all Grade II* listed, a designation reflecting particular interest. The Soane Museum holds Adam's original designs for the interior decoration, providing a documentary record unusual for speculative housing of this period. Harley Street lies one block to the west, and the medical district's concentration of consulting rooms extends to Mansfield Street, which has long attracted specialist practitioners.
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