Managed to decipher the cap! (With a lot of guessing involved...)
西山区棕树营城中村改善 (Renovation of Inner City, Zhongshuying, Xishan District)
二号片区指挥部 (Command centre for Plot #2)
I'm not sure if the command centre is within the plot itself, but here are the boundaries of the plot, about 500m across and 500m wide.