Berkhamsted Place, Berkhamsted
The book Berkhamsted: An Illustrated History contains quite a quite a lot of information about the house, including interior pictures in 1950 - which may have been as your mother knew it. I have not checked but the Victoria County History of Hertfordshire probably has quite a bit about its ownership before about 1900.
Berkhamsted Place was built in about 1580, using materials from the nearby ruined castle, and over the years there have been many changes of ownership and occupancy. In the early part of the 20th century it was the home of Mr. S. J. Ram K.C., who was followed by his son, Sir Granville Ram, the first Parliamentary Council ti the Treasury in 1937. Shortly after the Second World War the house - which then had nine bedrooms plus five staff bedrooms, was empty and put up for sale. It was converted into flats, but this was unsuccessful and the house was demolished in 1967.