Portman Square, Grade II listed garden square in Marylebone, London, GB.
Portman Square is a one-hectare garden square in Marylebone surrounded by Georgian townhouses and iron railings. The grounds contain mature London plane trees, winding paths, and informal plantings alongside a tennis court and children's play area.
Construction began in 1765 and was finished by 1784, with housing provided through long-term leases from the Portman Estate. This development formed part of the area's growth as a residential district built on private land in the 1700s.
Home House at number 20 shows Georgian design and later housed an art history institute, reflecting its role as a space for scholars and collections. The decorated rooms remain an example of how grand townhouses served intellectual purposes beyond private residence.
The garden is private and access is restricted to residents and workers with a paid subscription. Visitors should check access conditions in advance, as entry is not open to the general public without permission.
A drinking fountain at the eastern end was donated by Mariana Augusta to remember her husband Sir John James Hamilton. This listed structure stands as a personal memorial in the more visible area of the square.
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