I would guess they're both considered correct. I'd certainly hear them both spoken. :)

Academic
Whis is/are correct:
1-The apartment was bought by John to be used as a studio.
2-The apartment was bought by John to use as a studio.
I would guess they're both considered correct. I'd certainly hear them both spoken. :)
I'm not a teacher, so please consider any advice I give in that context.
They're both correct, but I'd say the second is more common.![]()