bykenut: Talked to a member of the Friends of Santa Teresa Park (had e-mailed a couple of folks in the county parks system, but got no response) and found out that is indeed is not an official trailhead and that the neighbors were trying to close it. A recent log from the cache up the trail from this one also mentioned that a ranger told them that they were closing this trailhead. I was thinking of moving this cache slightly, away from the complaining neighbor's house, but it would be even closer to someone else's house. Thus I have decided to archive this cache.
When I went to retrieve the cache last night, it was gone. Another reason for archiving.