Taverna Aventine
Located right across from the Transamerica Pyramid, the downstairs parlor here abuts the old sea wall, but the overall effect is more clubby basement bar than Barbary Coast. This room (as well as upstairs area) is rentable with a per-person rate for drinks and food. Prices vary.
582 Washington St., 415-981-1500, aventinesf.com

Homestead
A pressed tin ceiling and peanut shells scattered on the floor give this old Mission bar a saloon look. The rental room has vintage pricing ($25) which—bonus!— goes to charity and houses a communal table for 20 of your favorite cowpokes.
2301 Folsom St., 415-282-4663

Rosewood
Tap into the energy of North Beach without mingling with the yahoos. The two-room space in the back of the bar has a bartender, a smaller food staging area and a larger glass-walled room with its own patio. $300 for the room with a $1,000 bar minimum.
732 Broadway, 415-951-4886, rosewoodbar.com