Sally is correct on the tax rate and identifying which building. The HOA's for buildings vary depending on the services. Some buildings offer full service concierge, gym facilities, in house theaters, and more. Questions to ask yourself is how much value do you see in a full service building (a very nice way to live!) or do you prefer in a lower maintenance building. Mission Bay is a wonderful area to live in and you have plenty of options. Be sure to check out the UCSF Mission Bay gym. There is a waiting list but it is worth it!