You may have been wondering what was going on over at neighborhood fave Cafe Montana at 1534 Montana Ave. in Santa Monica. Recently, they closed down.  Then a sign went up in the window that announced they were remodeling and promising to reopen soon.  That sign quickly disappeared.  Then came the black plastic covering the windows…  According to a source, Cafe Montana will not be reopening, ending a 20 year long run.  The space is being developed for a new venture, tentatively named Ox & Son by businessman, restaurateur, and owner of Westside Rentals Mark Verge, who recently opened Art’s Table in Cafe Montana’s sister restaurant, the now-defunct Babalu.  No details on an opening date or menu, but I’m told the concept will be “high-end”.