The post office reinforced the residents' feeling of a community separate from the town of Yucaipa. In 1939 or 1940, the Calimesa Improvement Association, Inc. was formed. According to the constitution of the association, “The object and purpose of the association shall be the development and improvement of Calimesa and The Community”. Volunteers built a community center at the corner of Bryant and Avenue H, which had been designated a park site by the Redlands-Yucaipa Land Company. The "South Mesa Water Company" purchased the land for a well site and allowed the association to use it for community events.
The post office reinforced the residents' feeling of a community separate from the town of Yucaipa. In 1939 or 1940, the Calimesa Improvement Association, Inc. was formed. According to the constitution of the association, “The object and purpose of the associa?tion shall be the development and improvement of Calimesa and The Community”. Volunteers buil,t a community center at the corner of Bryant and Avenue H, which had been designated a park site by the Redlands-Yucaipa Land Company. The "South Mesa Water Company" purchased: the land for a well site and allowed the association to use it for community events.