When the kiosk lease came up for renewal in 1920, the Council decided to seek a married couple as lessees, with the wife to take the lease of the refreshment kiosk and residence, and the husband to be appointed as caretaker to the swimming baths and park. The first lease under this arrangement was taken up in October 1920. Once the caretaker was appointed, the Council arranged for the proper management of the baths: separate bathing hours for males and females were prescribed, the land side of the baths was enclosed with wire fencing, and admission prices were established. Changing rooms had been constructed by mid-1922. With the establishment of Greater Brisbane in August 1925, control and ownership of Mowbray Park was transferred to the new Greater Brisbane City Council. The park was a popular venue for sailing regattas in the 1920s and 1930s. In April 1936 the Church of England Grammar School applied to the Brisbane City Council for permission to erect a boat house on the river bank at Mowbray Park, near Laidlaw Parade, for use by the school's rowing club. With the application was submitted a plan for a hardwood structure with tiled roof, in dimension long by wide and high. The application was approved, and the school was granted a lease over the boat house site. The building, which is still owned by the school, was extended at a later date, and is now known as the Elder Hunter Boat House. It remains one of the oldest surviving rowing boat houses along the Brisbane River. Mowbray Park is understood to have been the site of a "tent city" for homeless families in the early 1930s, during the Great Depression. In mid-1945, the Brisbane City Council was preparing a final design and layout for Mowbray Park. A 1949 contour plan of the park indicates that much of its mid-20th century layout has been retained. In 1974 the First World War Memorial was moved to its present position to allow for extensions to the East Brisbane Bowling Club. About 1976, the 1910 kiosk/caretaker's cottage was demolished. The bandstand may have been demolished at this time also. The swimming enclosure was removed at an earlier period, but the stone retaining walls and steps associated with the baths remain, and have been included in this entry in the Heritage Register. The section of Mowbray Park formerly occupied by the tennis courts and scouts' den, (which have been removed), together with the bowls club and croquet club leases, has not been included in the entry in the Heritage Register.