Lunch near the Capitol (N and 15th)
In addition to Pennisi's mentioned above, you can walk over to Buckhorn Grill for one of the best tri-tip sandwiches in the region. La Bonne Soupe is also excellent for French sandwiches and soup.
1801 L St, Sacramento, CA 95811
La Bonne Soupe Cafe
920 8th St, Sacramento, CA 95814
Lots of options, but here are some of my faves. Within walking distance you've got Pennisi's (sandwiches), Gaylord (Indian), Vallejo's (Cal-Mex), and The Waterboy (Mediterranean). The best ethnic bets are over on Broadway, which is a pretty long walk (especially in the heat and wind we're having), but there's plenty of parking over there, so you might want to consder hopping in the car and heading over to Fortune House (HK Chinese), Pho Bac Hoa Viet (Vietnamese), Queen Sheba (Ethiopian) and/or New Canton (dim sum).
"Link to a place" seems to be stuck. I'll try again in a reply.
Here goes nothing...
2000 Capitol Avenue, Sacramento, CA 95814
Gaylord India Restaurant
1501 14th St, Sacramento, CA 95814
New Canton Restaurant
2523 Broadway, Sacramento, CA 95818
1237 J St, Sacramento, CA 95814
Vallejo's Mexican Restaurant
1331 O St, Sacramento, CA 95814
Fortune House Seafood Restaurant
1211 Broadway, Sacramento, CA 95818
Pho Bac Hoa Viet
1827 Broadway, Sacramento, CA 95818
1704 Broadway, Sacramento, CA 95818
Agreed that the Waterboy is pricey, even at lunch. Count on around $25pp, more if you want a glass of wine. But it's some of the best food Sacramento has to offer.
For sure try Jack's. I've never understood why it's so popular, but the food is reasonably good and a lot of people think the place is the bomb.
Second bennyboy's recommendation for the Rubicon, but at least for me a brewpub at lunch is a recipe for a less-than-productive afternoon (pass the willpower, please). Solid pub grub, and the beer is outstanding.