A Green Paris and the Joys of Urban Planning

The NY Times has a nice piece on the future of Paris as a "Green" compact city . I respect that they are thinking ahead about how to handle growth and its implications for housing markets and transportation and hence congestion in the city. I do not fully understand the height limit restrictions on housing towers. I appreciate that views are nice but building up has its advantages especially if the public health and crime costs of density have been tamed. It would interest me if Paris has its own Don Trumps and what these private developers are lobbying for? I also don't know how monocentric Paris is. Is everyone still trying to get downtown like in New York City or does it have multiple gravitational centers like Los Angeles?