There aren't many all-night places in Baltimore, so there's some sadness in the brief life and recent passing of Park Avenue's Parthenon Diner. Its replacement, the Park Avenue Grill, is only open until 10 p.m. (11 p.m. on Fridays and Saturdays), but for daytime denizens of downtown, it offers the basic lunch staples--deli sandwiches ($7-$8), soup ($4.99 for Maryland crab) and burgers ($8 plus toppings) and some diner-y breakfast specials in the morning. During a recent lunch hour, a few tables of lawyers and state government types sat down with a soundtrack of low volume dance tunes, but the place was mostly empty. The Greek décor of the Parthenon has been replaced by pictures of Olde Baltimore on stucco and wood paneling. A group of ladies at the window table thought the place had missed its mark--an upscale coffee bar would be better for the spot, they opined. Their troubles didn't end there--the soup of the day was sent back as too salty, and their water glasses sat unfilled ("I've never had this happen anywhere," exclaimed one). The Texas chicken sandwich (grilled, with bacon, provolone and barbecue sauce for $9.99), by contrast, was excellent, and the service was fast--in an out in about half an hour. It was tempting to stick around to see what the ladies thought of their main course, but the Grill was out of the homemade cannoli, so it was back to work.