The plot on which the cross stands fall under the Vacant Land Tenant (VLT) policy of the BMC under which, the civic body leased out plots to private owners before independence
The 114-year-old Holy Cross in Mahim, the origin of which dates to the Edwardian Era, has come in the way of a bridge widening project that has been taken up by the Brihanmumbai Municipal Corporation (BMC). Situated near Mahim Creek, the Holy Cross serves as a place of worship for East Indians, Catholics, and the Koli community Christians living in the neighbourhood said that they have a strong sense of religious sentiment attached to this cross.
https://www.hindustantimes.com/cities/mumbai-news/bmc-wants-114-yr-old-holy-cross-to-be-relocated-for-bridge-widening-101659726587392.html
Source: Hindustan Times