One of the big things they're trying to do in San Diego is build a hotel on site as well as other modifications of their current orca venue. They would need a development permit from the California Coastal Commission because their location is within the protected coastal area. It's actually a bit crazy since nearly anyone who lives within four miles of the coast needs such a permit to do as much as repave a driveway. It's a shorter distance in incorporated cities, but SeaWorld is certainly subject to such regulation.
I remember back when they first proposed it, the commission said that they would likely require that SeaWorld cease all orca breeding and other activities in order to get that permit. They frankly had no authority (mission creep is how I'd describe their actions) to do so since they're captive animals. Some of their authority includes protecting coastal resources for the benefit of native wildlife, but that was really bizarre since captive orcas are regulated by the US Department of Agriculture. In the end they did cease all breeding and modified the shows, but that was probably more due to public pressure.
http://www.sandiegouniontribune.com/business/tourism/sd-fi-orca-seaworld-20161104-story.html
Just last year, SeaWorld went before the Coastal Commission seeking approval of a now abandoned plan to double the volume of the orcas’ habitat. While the commission OK’d the plan, it imposed a condition that SeaWorld cease breeding its orcas.
The company protested, but months later, responding to mounting public pressure, announced it would end captive breeding of its killer whales at all three namesake marine parks.