The site's history stretches back to at least 1610, when David McCanney owned what was then known as the Castle of Parck. By 1631, Simon Fanning had taken possession, though he required a pardon for alienating the property. The original tower house, depicted on the 1657 Down Survey map of the North Liberties, would have been a typical defensive structure of its time; a practical fortification overlooking the River Shannon.

The transformation from medieval tower house to Georgian country residence occurred around 1750, when the current five-bay, two-storey house was constructed, possibly to designs by Francis Bindon. The architectural details support this attribution, particularly the distinctive lunette resting on the Venetian window's keystone, a hallmark of Bindon's work. Rather than demolishing the old tower house entirely, the builders incorporated it into the eastern portion of the new structure, creating an intriguing blend of defensive medieval architecture and refined Georgian elegance. The fine limestone dressings throughout the building showcase the exceptional craftsmanship of eighteenth-century stonemasons.

The property's nineteenth-century incarnation brought further changes when Christopher Delmege acquired it in 1833, having previously been owned by the O'Briens of Thomond and later the Ormsbys, who knew it as Blackland Castle. Delmege embraced the Romantic movement's fascination with medieval architecture, adding crenellated battlements and a curtain wall that gave the Georgian house a more castle-like appearance. By this time, the building had grown to four storeys and commanded impressive views over the Shannon. Though now disused, Castle Park remains a remarkable testament to how Irish country houses adapted and evolved, with each generation of owners leaving their mark whilst preserving elements of what came before.