While I agree that a lot of office space is under-utilised and unnecessary, vertical housing is an enormous boon for urban planning - it's vastly more efficient than urban sprawl (e.g. it's cheaper for local government to provide services), and arguably better for the environment (e.g. making good public transport practical). For many people, it's a better living experience too - I used to live in a bungalow in the suburbs, but once I'd experienced living in a good apartment in the middle of my home city, I decided I'd never go back. Not everyone feels that way, I understand, but if we're want to preserve our valuable land for farming and nature, we need to densify.