1st place I'd check is my county GIS system. It'll list the entity that owns the property (typically, a neigborhood entrance is owned by a development firm). Same would hold true for other commercial properties. You should be able to do the detective work (phone number), based on your findings (on GIS).
The property owners will be able to let you know if a management co. is being utilized to handle maintenance, there.
That's where I'd look.