I am the listing agent of this property. As all other real estate agent responded to you, HOA fee is $694.94 for this unit and it's already under contract.
I wanted to add a little more information. This is Coop, and not a condo. Generally speaking, coop HOA is higher than condo HOA, but price itself is much lower. Most of Coop HOA includes all utilites (water, garbage, PGE), building insurance, commona area maintenance, and partial of property tax. You need to calculate whihc is better fit for you.
Also, lenders are very limited for most of coop in California. For this complex, only NCB & First Republic finance as long as buyer has more than 20% down payment.
Coop is very common in East Coast, but rare in San Francisco bay area. However, as long as you understand the difference, there is nothing you have to be worried.