Question: Was the Royal Society once a part of St James's Palace?, Answer:Yes, Description of Royal Society: National academy of science in the United Kingdom, Fact1: The Royal Society has been based at 6–9 Carlton House Terrace since 1967., Fact2: The land on which Carlton House Terrace was built had once been part of the grounds of St James's Palace.
Step1: Where has The Royal Society been based at since 1976?, Step2: Was the land where #1 was built on previously part of the grounds of St James's Palace? , Wikipedia page for step 1: The Royal Society, Wikipedia page for step 2:  St James's Palace, Carlton House Terrace , not_definitive_answer: False, incorrect_answer: False