444 S. Flower St. (also known as the "LA Law" Building, and nowadays as Citigroup Center) is next door to the tallest building west of the Mississippi, and across the street from the Central Public Library, so it is not hard to find. It can be a bit confusing to get to, however, because of all the one way streets downtown. Check Google maps or follow directions below.
Public Transportation
Take the Red (or Purple) Line to either Pershing Square or 7th St. Metro. Destination is about a 5 minute walk from each stop.
From Union Station: take the "B" Dash bus. Get off just after the bus turns right from Grand Ave. to 5th St.
Driving Directions to 444 S. Flower St.
From the Harbor Freeway heading north: Exit 3rd Street, turn right on Flower St.
From the Pasadena Freeway heading south: Exit 3rd St., left on Beaudry, left on ramp over freeway toward Flower St., right on Flower St.
From the Hollywood Freeway heading east: Exit at Temple Street, go straight on Hope Street, bear right down the hill until it turns into Flower Street.
From the Santa Ana/Hollywood Freeway heading west: Exit at Grand Ave., turn right on 1st St., left on Hope, bear right down the hill to Flower St.
Parking
Parking is available in the building (but it's expensive). Enter from Flower St. (which is one way heading south)
Arco Plaza garage (which for some reason is now called City National garage) just north of 444 St. Flower. Get your car washed one floor above the entrance for about $15, and parking is free!
Under the library (entrance on Flower St. just south of 5th St.). Arrive before 9:30 a.m. and parking is $13 for the day. If you have a library card, you can get it validated in the library and park for 3 hours for about $9. Otherwise that garage is really expensive also.
Cheapest option: Lot on 3rd and Beaudry across the street from the school district headquarters and next door to LA Center studios. Only $6 for parking, but it's a long hike across the freeway.
Other recommended nearby garages: Pershing Square garage (3 blocks east of office on 5th St.), World Trade Center garage (2 blocks north of office on Flower).