St Marys Park is one of the largest reserves within the suburb and was originally the training ground of the South Adelaide Football Club.

In the 1930s it was sold as a home to Ted Grindell, the local council "garbo" until the ruins were demolished in 1966 and replaced with a car dealership.

Watson himself moved into John Daw's corner house and on his death the property was purchased by Dr Hugh LLoyd who had a nearby surgery on South Road in Clovelly Park which later became the Clovelly Park Community Health Centre.

The Great Depression of the 1930s followed by World War II stifled land sales and by 1949 only 25 people were living in the estates.

Kiley Reserve was later acquired by the State Government for the South Road Primary School which was built in 1951.

Construction of the Chrysler vehicle manufacturing plant in Tonsley Park in 1963 led to many support industries being developed in St Marys.

An unofficial Post Office was opened on South Road on 16 May 1927 but was discontinued in 1952 when postal services were taken over by a shop at 18 Quinlan Avenue.

In 1841, John Wickham Daw donated one acre of his farm for the establishment of the St Mary's Church of England.

South Road Primary School was opened in 1951 on land set aside for Kiley reserve in the subdivision of Clovelly Gardens which was never developed.

St Bernadette's Catholic Primary School was opened in 1952 and staffed by Dominican nuns.

In 1971 the ground was officially re-opened as Panther Park with an exhibition match between South Adelaide and the 1970 VFL premiers, Carlton.