Highland Avenue's median parkway with historic palm trees, between Melrose Avenue and Wilshire Boulevard, was designated a Los Angeles Historic-Cultural Monument in 1972. The Queen palms (Syagrus romanzoffiana) and Mexican fan palms (Washingtonia robusta) were planted in 1928.

Today the HPHA'48 has a committee made up of Highland Ave. residents and board members who help over see the maintenance  and preservation of the of the median.