It was built between 1765 and 1784 on land belonging to Henry William Portman. It included residences of Alexander Hamilton, 10th Duke of Hamilton, Sir Brook Bridges, 3rd Baronet, Henry Pelham-Clinton, 4th Duke of Newcastle-under-Lyne, George Keppel, 6th Earl of Albemarle, Sir Charles Asgill, 1st Baronet and William Henry Percy. Alexander Duff, 1st Duke of Fife maintained his London residence at No. 15 Portman Square.
- No's 11-15 built in 1773-1776 by the famous architect James Wyatt in cooperation with his brother the builder Samuel Wyatt. First houses in which Coade stone was used. Demolished in the 20th century. Ref: James Wyatt, architect to George III. Author John Martin Robinson. Yale University Press 2012.
- No. 20 – Home House, built by Robert Adam between 1773 and 1777 for Elizabeth, Countess of Home, and later used by the Courtauld Institute.
- No. 22 – Montagu House, built in the northwest corner of the square by James Stuart between 1777 and 1781 for Mrs. Elizabeth Montagu, demolished in the Blitz by an incendiary bomb.
- No. 30 – Churchill Hotel, incorporating the Michelin-starred Locanda Locatelli. This property was formerly the home of George Keppel, grandson of George Keppel, 6th Earl of Albemarle (noted above) and the husband of Alice Keppel, the mistress of King Edward VII.
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