D.C. has a kosher restaurant problem. Owners say to blame the math...

Oro Nami, a kosher sushi restaurant in Washington D.C., held its grand opening last year with upscale features including red velvet booths and projected clocks, drawing Capitol Hill staffers, Trump administration appointees, and K Street lobbyists.

Owners of kosher restaurants in the city attribute ongoing operational difficulties to basic economic calculations rather than other factors.