Furthermore, it's been incumbent upon property owners and renters to maintain this sort of semipublic space of the Parkway.

此外，业主和租户有责任维护公园大道的这种半公共空间。

So why doesn't the city properly incentivize developers to create these sort of semipublic, shaded environments behind the property line that are contiguous with the sidewalk?

那么，为什么城市不适当地激励开发商在地产线后面、与人行道相邻的半公共、阴凉的环境呢？