Greenmount Hill, either by Old York Road or Great Eastern Highway, is the main ascent to, or descent from the Darling Scarp, and has been a regular site of vehicle breakdowns or accidents due to the slope.

Greenmount was a railway stopping place until 1954 when the Mundaring Loop was closed for passenger traffic, however trains continued to work on the line to the Mountain Quarry in Boya until 1962.

Also bisection by a Western Power line across the hill, which corresponds with the old border of the Greenmount National Park, has created an eyesore[citation needed], as well as a serious point of erosion.

Road access through the Greenmount National Park has been closed due to vandalism, except where permission and keys have been obtained from the Department of Environment and Conservation regional office in Mundaring.

The front entry door is surrounded by stained glass and highlights, which incorporates the name "Undercliffe" into its design, and the side panels contain the initials of Robinson.

During the Great Depression, Undercliffe House was used as a parish poorhouse eventually being donated to the Rev John Bell in 1937, which he then converted into a convalescent home.

The facilities were upgraded and new buildings added for an additional nursing home, maternity wing and specialist consulting rooms.

[11] The Shire of Mundaring Municipal Inventory has Greenmount Hill – as a landmark – with high aesthetic, social, historic and scientific significance.