Union Cowork Furnished Office Space California & San Marcos Union cowork san marcos is housed in north city, a 200-acre mixed use development next to california state university san marcos. North city serves as the region’s transportation hub and education node making it the perfect location for union’s diverse offerings that cater to businesses and students alike. Ripe with networking opportunities, you’ll find a diverse professional community who’ve established a home within our doors making union a destination for city officials, entrepreneurs, and startups.