Legal Question in Real Estate Law in California

Re: Tenant notification inquiry

First thing you need to do is check local rent and eviction control ordinances, if any.

Then, you need to balance giving your tenants maximum possible notice (as a matter of fairness, not necessarily as a matter of law) versus getting the permits, etc. in place for your proposed new use. You need to determine zoning problems and other regulatory aspects of the proposed use. Will you be the operator, or will you lease the building to an established agency that knows this business and has medical staff to run it properly?

If your tenants are on leases (rather than month-to-month rental agreements), you need to let them expire.

I do not know of any state-wide law that restricts your right to terminate all rentals for this purpose provided proper notice is given; due to Civil Code section 1946.1(b), I would recommend not less than 60 days notice be given.