Plaza 1640 Apartments a National City Community, located in San Diego, CA, is Now Leasing. Plaza 1640, a residential community featuring Studio, One-, and Two-Bedroom Apartments Pet-Friendly Community Plaza 1640 Apartments a National City Community, located in San Diego, CA, is Now Leasing. Plaza 1640, a residential community featuring Studio, One-, and Two-Bedroom Apartments Pet-Friendly Community