You have two really great things going for you:
1. You have a guaranteed pension, with at least a small guaranteed COLA.
2. You have fully-paid medical. It is hard to overstate how big a benefit this is, particularly as you age.
The math says that you can retire. As noted above, though, you're pretty close to the line, so a big expense, or a market drop early into retirement, could affect your long-term prospects. So what I would suggest is to really think about and do some research on all of the various things you could do to either cut expenses or bring in more money.
Do you currently track your spending? The reality is that a $70K/yr budget has a lot of room to play with, particularly when none of it is taken up with debt repayment. I assume your rent is a big part of that given where you live, so that is one thing to consider changing -- could you move to a smaller/cheaper place if you needed to, or take on a roommate?
Do you have/need a car? Given the weather in your part of the country, you may be able to manage with just a scooter or ebike, which would cost less to own, less to maintain, less to operate, etc. What kind of insurance coverage do you have, both vehicle and personal/renters? May be worth shopping around and/or seeing if you would save money by cutting back on some of your coverages.
I'm sure there are a lot of little things you can change around the edges, like substituting some cheaper groceries. But don't limit yourself to that. Think about big options, like moving, going car-less, etc. You may or may not choose to do so, but those are all options that are out there and so are worthy of consideration. Is it worth another [6 months/year/3 years/etc.] at the job if it allows you to [keep your apartment/keep your car/stay in CA/etc.]? If you don't even consider those big options, you can't ever weigh them fairly against the value of the additional time at work they may be costing you.
Don't forget options that may bring you more income. Certainly getting a roommate is one. But do you have any hobbies you could monetize -- anything you like to make that you can sell for a few thousand a year, or any particular skills people would pay you for (tutoring, organizing, etc.)? Could you go part-time instead of quitting entirely? Or would you be willing to take on a part-time job for 10-20 hrs/week if allows you to quit your primary job? If you could bring in, say, $10K/yr doing something small on the side, that may not sound like a whole lot of money -- and yet it is almost half the money you need to cover the gap between your pension and your expenses.
Finally, I do want to clarify one thing: Is your pension $4K/mo. for life if you retire now, at 60? If so, does that increase if you work a bit longer, and if so, by how much? Be sure you fully understand the terms of the pension, including any cuts you may take for retiring before 65 and/or increases you could earn by working longer -- that is the bulk of all of your future income, so make sure you get that right.