The controversy around the construction of Hindu mandir in Islamabad reflects Pakistan's deeply troubled relationship with its Hindu past, tradition, and built heritage.

As Amstutz's work shows, Pakistani state proudly projects 'Buddhist heritage' to showcase Pakistan as an ancient land, but often masking the rich Hindu history of the region. https://blogs.lse.ac.uk/southasia/2019/07/22/long-read-a-pakistani-homeland-for-buddhism-buddhist-art-muslim-nationalism-and-global-public-history/

Since 1947,most Gurduwaras remain unoccupied but in a state of ruin. But almost all Mandirs converted into schools,mosques,madrassas, or residential quarters for refugees. In parts of East Punjab,Muslim sites appropriated for articulating a Dalit identity

e.g.Sanatan Dharam Mandir is now Islamia High School, and Dayanand Anglo-Vedic College (D.A.V. College) is Islamia College Lahore.
https://archive.lums.edu.pk/interactives/hindu/home
Dayal Singh College remained unchanged, probably because it was in the name of a trust. Don't know about DAV's legal status.