I think you want to buy a house there.
Zhongshan Gate used to be all bungalows, so most of them were relocated houses, and many of them haven't been given rooms yet. As for those you mentioned, they are relatively new and old, basically the same. The buildings on the left side of Guangning Road are opposite to the experimental building. Higher quality? I think it's almost the same, with both good and bad. Zhongshan Gate is full of old people, but it will become a young Zhongshan Gate in a few years.