Historic property in London
Belsize House was a historic residence in Belsize Park in what is today the London Borough of Camden. It was a country estate located south of 
Hampstead, which was then some distance away from the outskirts of the capital.
History.
An Elizabethan manor house stood on the site. Daniel O'Neill, an Irish Cavalier in the English Civil Wars, was granted Belsize House by Charles II following the Restoration in 1660. O'Neill rebuilt the house in 1663 and it again underwent significant further remodelling from 1744 to 1746. 
After 1720, Belsize became a place of public entertainment to cater to the growing traffic heading towards the fashionable Hampstead Wells. This included serving refreshments as well as turning the grounds into pleasure gardens. It soon gained a reputation for hosting gambling as well.
It subsequently reverted to being a residence. The politician Spencer Perceval rented the house between 1798 and 1807. He later served as Prime Minister before his assassination in 1812. It was demolished in 1853 and replaced by a series of streets of white stucco residences to provide upmarket housing for the expanding population of the city. These included Belsize Park Gardens while Belsize Lane a little to the north is an older road. The old house stood close to what is now St Peter's Church on Belsize Square and faced eastwards. What was once the old elm-lined approach to the house is now Belsize Avenue which heads east to Haverstock Hill.
References.
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