see Poland Street 10 to 18 & 45 to 48 in London Addresses dataset
Keane Fitzgerald 48 Poland St ratebooks 1777-1783 / letter to Keane Fitzgerald at Royal Society dated 1724 RS/PP11/MM.4.58 but this date may be an error as there was no earlier Keane Fitzgerald in FRS list / he married 19.7.1746 at Oxford Chapel, Vere St, Mary Joye / 1748 London Metr Archives HB/D/138 HM Bailiff & Collector for Bailiwick of St James in the Fields / Fellow of Royal Society 1756 / Royal Society 1757 experiment with distilled salt water in steam engines, 1760 metalline thermometer, and many thereafter / London Chronicle 19.6.1761 letter from Keane Fitzgerald Fellow of the Royal Society Poland Street on pruning fruit trees / 1765 Receiver General of Crown revenues in four counties / 1772 vice-president of Socy for Arts, Manufactures & Commerce / 1775 chair of meeting of independent proprietors of East India stock / 1777 his Letter to the Directors of the East India Company published / Morning Post 30.7.1782 sale of Isleworth villa of Keane Fitzgerald deceased including a glassichord (supposed according to antiquitymusic.com to have been invented c.1785 by Beyer in Paris and named by Benjamin Franklin) / Gazetteer 30.12.1782 sale of his furniture in Poland St including old masters / Morning Post 13.11.1783 lease of house of Keane Fitzgerald in Poland Street and the two adjoining for sale (judging from later sale Morning Post 3.2.1791 these were one each side, nos 47, 48 and 49 in the c. 1790 numbering I have used) / Westmr Arch 69/63 (no 48?) assigned to Thomas Skinner of Aldersgate St for £650 by Keane Fitzgerald (the son) / Morning Post 7.3.1786 sale of deceased Keane Fitzgerald's £500 share in Opera House and a silver ticket / Keane Fitzgerald junior was clerk of the warrants in the Court of Common Pleas and Register of Deeds for Middlesex from 1778. Member of Whig Club 1785. He (bach of St Geo H Sq) married Marie Le Keux sp of Christchurch Middlesex (papers said of Sydenham) sp by lic 28.10.1788. He died 14.10.1831 in 84th year, his will PCC 1831