Northern Building Maintenance is a leading provider of customized janitorial, exterior maintenance, and commercial cleaning services in San Diego, Orange County, and Los Angeles.Northern Building Maintenance is a leading provider of customized janitorial, exterior maintenance, and commercial cleaning services in San Diego, Orange County, and Los Angeles.Northern Building Maintenance is a leading provider of customized janitorial, exterior maintenance, and commercial cleaning services in San Diego, Orange County, and Los Angeles.Northern Building Maintenance is a leading provider of customized janitorial, exterior maintenance, and commercial cleaning services in San Diego, Orange County, and Los Angeles.Northern Building Maintenance is a leading provider of customized janitorial, exterior maintenance, and commercial cleaning services in San Diego, Orange County, and Los Angeles.Northern Building Maintenance is a leading provider of customized janitorial, exterior maintenance, and commercial cleaning services in San Diego, Orange County, and Los Angeles.