If they don't you may want to contact your realtor. I did a little checking and this 7 unit building has not had any MLS reported activity since 2001 when it was withdrawn so there is little information of any recent realtors who might have that information readily available for you.
You can also try just going down and meeting some of the owners as I am sure they will know who to contact to get information regarding the HOA.
There are no active listings at 218 Union. Why do you need to contact the management company? Are you getting ready to sell your property?
Paragon Real Estate Group
CA DRE 01844627