Looking at this photo taken by David Ritchie in 1905, it is clear the Greenhall Entrance Lodge (at the top of the hill) had some fine details to its architecture. Zooming in on the photo revealed that the soffits and fascia boards were ornately carved in wood and that the windows are arched, of a gothic design. The whole lodge feels very european or continental in style.
The lodge was sited at the current entrance to the park, which was out of picture to the right. It was demolished in 1966. With thanks to Alex Bowie for sharing.