KhwajaSara Basti Khan was an important noble in the reign of Sikander Lodi. Though today its in a limited area but he had enclosed an extensive piece of land near Hazrat Nizamuddin Basti and built a mosque, baoli and tomb in it with an impressive gateway as an entrance to it. The tomb was built in 1488 AD.
The Baoli dried up centuries ago but the gateway and tomb survive.
It is the Jama Masjid of Defence Colony.
A few photographs from my visit thee with Syed Mohammad Qasim follow.
The Gateway
The Madarsa attached to the Gateway
The area between the tomb and mosque has been covered and is used for namaz.
As it was time for zohar prayers I offered my prayers here
Most people however preferred to pray in the courtyard under a warm wintry sun
Staircase leads upto Basti Khan’s tomb on the top
No sign of the grave now
Since it is now a madarsa and mosque, the tomb is quite neglected. As per Islam concrete graves are frowned upon and so no attention paid to it.
The interior of the tomb 
The brightly coloured ceiling of the mosque
Student of the madarsa
there are no traces of the baoli which was built by him and probably the tank for ablution has replaced it.