see Poland Street 1 to 9 & 49 to 62 in London Addresses dataset
ratebooks 51 (then 50) Poland St 1784 John Joseph Glassatree 1785-6 James Glassatree / directory 1786 J G De La Cetree merchant 50 Poland St / 17.10. 1786 bankrupt John Joseph Garnier de la Setree late of Princes St, London, merchant, certificate Feb 1788 / 11.1.1782 Garnier de la Cetree ancien capitaine d'infanterie (Memoires Secrets London 1783 vol 20 p19)