请教老师一个句子的意思

老师好！

向老师请教一个句子：Of the 10 cities with vending machines nationwide, one of them will be located at Rockefeller Center in New York City, just south of its famed Christmas tree. 我想不知道前面的这部分Of the 10 cities with vending machines nationwide跟后面的主句有哪些联系，just south of its famed Christmas tree中的its指的是哪个？

文章网址：https://www.goodnewsnetwork.org/vending-machines-are-now-giving-machines-in-10-cities/

one of them=one of the vending machines. 作者的这个句子结构值得商榷，用of the 10 cities...作范围状语，比较容易让读者把one of them误读为one of the cities, 如此读起来逻辑不通，又得返回来重新探寻them的先行词。所以我感觉句子有改进空间，比如Vending machines are available in 10 cities nationwide. One of such machines will be located...。its指Rockefeller Center。