The property at 1 Montrose Road, Montrose (otherwise known as Alta Dena), is locally significant to the Yarra Ranges Council. Specifically, the form, scale, detailing and sitting of the 1929 Tudor Revival style residence, along with five remnant mature trees on the property, including a Grey Poplar (Populus x canadensis), two Lilly Pillys (Syzgium smithii) and a Japanese Cedar (Cryptomeria japonica) in the south garden, as well as the mature sweet gum (Liquidambar) in the east garden, are of local significance. Later alterations and additions, including the c.1953 brick and concrete rear extension to the northern elevation, the c.1952-1962 freestanding single-storey outbuilding to the norther-east corner of the property, substantially altered garage, and 1996 single-storey rear extension to the north-west corner of the main residence are not significant. 

 Alta Dena is of local historical and aesthetic significance to the township of Montrose and Yarra Ranges Council more broadly. 

 Alta Dena is historically significant to the township of Montrose as an interwar era residence that was constructed during the growth of the Yarra Ranges area as a tourist destination and picturesque resort town during the 1920s and 1930s. Erected as a country holiday home, Alta Dena not only forms a tangible link to this phase of development, which saw the proliferation of architect designed guest houses by affluent Victorians across the mountainous districts of Healesville, Warburton and the Dandenongs, but also provides insight into the ways the region’s built environment was shaped by an increase in population and tourism during the interwar period.