BYU’s funding mechanisms are not set up to easily pay for a large parking structure. When a college funds a new building, they want to maximize the square footage bang for their buck, which means the largest building they can get.
No one college wants to pay for parking that will be used be the general campus. And there’s no easy way for multiple colleges to pool funds for new parking on what is already scarce real estate. And university-wide funds are for maintenance, not new construction.
And Provo City won’t require adjacent parking for new buildings since BYU has more than adequate stall counts in the north lots, which fits our stated objective of forcing users to park on the exterior to maintain a walking campus on the interior.