A Lincoln Property Management employee found the device while doing maintenance work about 1:40 p.m. Wednesday, brought it back to the management office at 10323 Orleck St. and called police, San Diego police Officer Dan Lasher said.
Officers arrived and evacuated the building, Lasher said. An Explosive Ordnance Disposal unit arrived and removed the device, he said.
The Tierrasanta area was formerly known as Camp Elliott and was used as a U.S. Marine Corps training facility in the 1940s. The area was later developed for homes, and old ordnance occasionally turned up.