The Coronado Tennis Association: 

a non-profit player organization governed by a volunteer board of  directors that organizes social tennis for the Coronado community.  CTA  membership provides its members play in CTA leagues, ladders, mixers,  events, etc. The CTA Board of Directors serves as a liaison between the  City of Coronado and the players.

The City of Coronado Recreation Services Dept: 

owns  and maintains all courts, equipment and surrounding buildings.   Determines court use by CTA and all others, rents courts, rents ball  machines, provides classes with City contracted tennis pros.  

City's website: https://www.coronado.ca.us/government/departments_divisions/recreationandgolfservices/tennis