Best place to eat alone
i imagine if you are in town for business you are looking mainly for lunch and dinner recs.
grocery on 13th for great soups
cafe old nelson (one right at broad and the other on 13th up from grocery)
for dinner -
good dog - on 15th great burger
village whiskey - so much easier to get a seat at the bar if you are alone!
el vez - decent mexican food and great bar placement for people watching
rouge - friendly bar staff and great people watching
hope this is not too late
OK, this is not super close to City Hall, but I think places where you can eat at the bar are fun when you're alone, and you can do so at Zahav and the food is good (middle eastern, small plates). Location is south of Walnut Street between 2nd and 3rd: