Should I buy this Lexus?

I’ve come across an interesting listing (linked below) for a 2000 Lexus LX 470. I’m aware that, for this price, I’m going to be making some sort of mileage or quality tradeoffs.

That being said, this one has some rust on the bottom, and I’m wondering if anyone had advice on how much is too much rust, what it might cost to patch it, and maybe if it’s even worth considering this vehicle.

Let me know what you think, would be appreciated!