Private underground parking facilities are incredibly expensive. It's not common at all for a planned future tower to get intentionally capped at grade. West Village 3, BLVD 3, Two Park Central. I can't think of more names. The developers of Park Point would be going broke if they had built the parking for the second phase with the first as the development has gone from a tower to a medium rise.
The office boom with commercial parking renting at North American record prices is a different apple. Building was a matter of securing tenants than finding financing and securing tenants was easy.