Gaslamp Pizza 505 Fifth Ave., San Diego, CA 92101 (619) 231-7542 gaslamppizza.com Gaslamp Pizza: home of the slices in downtown. Located in the heart of downtown San Diego, this restaurant is family owned and operated for over 12 years. Gaslamp Pizza and the crew is ready to deliver to you. HOURS Sun. – Weds.: 10 a.m. – 3 a.m. Thurs. – Sat.: 10 a.m. – 4 a.m.