Legal Question in Real Estate Law in California

Re: leasehold land beneath condo building

Probably; does the lease call for escalation according to the index? Read the lease, make sure you're using the right index for "cost of living" (there are several, with different formal names), and then perhaps you might sit down and discuss your views with the owner before taking stronger action? There might be a simple resolution, such as one party or the other is doing the calculations wrong, with no intent to shaft the other party.