1. 6 month emergency fund
2. Roth IRA if under income limit
3. HSA if available
4. Traditional IRA
5. Brokerage account
This question can have multiple answers based on your goals. The ability to draw from you pension at age 50 makes me question if you have a career which would allow you to draw early from your retirement accounts as well (such as a police officer, firefighter, etc.). Do you qualify for that? I believe it's age 51 for IRA/401k without penalty if you fall into this category.
I would want that money invested NOW, not sitting around for the almost 10 years it will take to be able to invest that much into your 457 ($19,500 - $12,000 = $7,500/year---$75,000 profit / $7,500 = 10 years). My natural progression for investment vehicles (excluding real estate) is: Match/Roth/Tax deferred/ Taxable. If you have a Roth 401k, that's a fantastic option and I'd max that out. If you have a HSA, I'd max that as well.
Lastly, while you said you don't want to be a landlord, that doesn't necessarily mean you couldn't hire management. You could also look into syndications, hard money lending, flipping, etc. Lots of niches that are encompassed by 'Real Estate Investing' that don't require managing tenants.
Best of Luck!
***not tax, investment, or legal advise. This is my personal opinion and what I would do if I were in your shoes.***