washing machine standpipe

I'm DIYing a laundry room directly above the old laundry area. The new standpipe would be against an outside wall. So, I'm asking myself, why not just run an inch-and-a-half PVC line hard attached to the washing machine drain hose, and drop it into the standpipe in the basement, just like the...

EDITED*** initial post updated and irrelevant plan removed... If that's a no-no please let me know! Just trying to keep the post relevant to anyone reading now or in the future. Per the previous, I am attempting to install a laundry sink next to my washing machine and still keep the standpipe...

Hello. I hope I can get some advice from those with more experience than me at this particular situation. In the photo is my current washing machine outlet box and standpipe which I ultimately want to move to the left where indicated. I am removing a utility sink outside the photo frame to the...