No, not just housing but a boulevard. By definition a boulevard is wide. It wouldn’t be a boulevard if they made the road narrow by building houses on the road rather than by the side of the road, so while the article doesn’t explicitly say it, by calling it “boulevards of new housing” implies that the thoroughfare does indeed remain wide, and becomes tree lined rather than car-lined.

The Cambridge English Dictionary defines a boulevard as:

“A wide road in a city, usually with trees on each side or along the centre”