Any of them properly equipped for strength training? Went ot at least a couple in the area where they didn't want people to use chalk and the floors were not meant to hold anything heavy, so they'd forbid you to deadlift.
World Gym caters to the powerlifter set that I think you're seeking -- they provide chalk (iirc) and have multiple squat cages and a deadlift mat and use olympic barbells.
But then...I have yet to go to a gym in San Francisco that didn't have at least one squat rack and space for deadlifts. I don't know where you were going that wasn't properly equipped for strength training.
Let's be honest, that's where the money is. Casual gym goers who will come in twice a week for 30 minutes (and then possibly stop coming, but keep paying) on a Nautilus, followed right away by a nice glass of Jamba Juice. Gym goers who will pay exorbitant amounts of cash for personal training to "strengthen their core".
Some dude who has a high chance of getting himself hurt and who might bust your floors is probably not even worth considering for membership in the big scheme of things. Too much of a hassle.
I have tried Crunch, World Gym, Club One, Fitness SF, and the Embarcadero YMCA and I would have to say that World Gym is the most serious gym here in the city. They have 3 really nice squat cages (shown here: http://s3-media4.ak.yelpcdn.com/bphoto/ZsbwBday0IKkB1SljAUbQ...), tons of bumper plates, a huge assortment of freeweights, and a ton of different machines. Oh and they have a bucket of chalk next to the cages, so that's definitely encouraged there.
If you're looking for a gym to just lift heavy shit, this is the place. Yeah, there are some typical gym bros here, but I've never had an problems and everyone is pretty good at following proper gym etiquette.
