sesquicoastal
Of, or pertaining to, one and a half coasts.
"My family has a villa near the beach in Corpus Christi, but we usually summer in our condo in the Upper West Side."
"Oh, so you're one of those pesky sesquicoastal elites, huh?"
"Oh, so you're one of those pesky sesquicoastal elites, huh?"