Before the end of the year, two restaurants that have been dishing out casual Mexican food for decades will close as their owners focus on their suburban businesses. The owners of Taco House, a Tex-Mex diner that has served customers from its original location at 581 S. Federal Blvd., since 1958, gave their news at the beginning of December. It is one of the oldest Mexican establishments in the metro area. Another location, at 1335 Wadsworth Blvd. in Lakewood is staying open into the new year.