Arcelia's has closed. A sign on the front door thanks customers for its twenty years of business. Arcelia's first opened in 1990 on South 9th Street in Soulard. It moved to its current location five years later. No one answered the restaurant's phone when I called just now. More as I learn it.
Update: (Tuesday, 1.4, 3:00 p.m.) Not much to add except that I can confirm the closure, having dropped by the restaurant this afternoon and snapped the photo above.
Update #2: (Monday, 1.10, 3:50 p.m.) Arcelia's website now carries a message saying that the restaurant is "temporarily closed" and looking for "new ownership to carry on the family tradition." (h/t to commenter "Lafayette Square Neighbor")