Corner shower drain prob during tear-out

Hi! New to this forum, and hope you can help. I am doing a tear-out of my corner shower in a small spare bedroom bath. I finally got down to the base and I can not get it out over the drain. I don't want to ruin anything, but I don't see how I can get the base over the drain.............

Any help would be appreciated!!!

drain

If it is glued on, you won't get it "off over the drain". If it is a rubber joint it should pull off. A lead joint will have to be drilled out.