Jami Masjid in Khambhat, Gujarat, built in typical Hindu

Typical Gujarat style entrance.-Jami Masjid,Khambhat, Mapio.net

Jami Masjid,Khambhat, Gujarat TrekEarth

Jami Masjid, a mosque in Khambhat, Gujarat, India is one of the oldest Islamic monuments in Gujarat. Built in 1325 AD, the striking feature of this mosque is it's colonnaded open courtyard built with 100 columns. Khambat, 78 km from Vadadora (Baroda), was also known as Cambay and this area used to be a prosperous mercantile port town near the estuary of Mahi river. In the 7th century itself, trading activities were going on.

entrance corridor,Jami Masjid from the eastern Wikipedia

Alauddin Khalji (1296–1315), a notorious Muslim ruler of the slave dynasty of Delhi Sultanate raided with his highly motivated army and seized Khambhat in 1324. Being a religions bigot, he did not take much time to destroy the Hindu and Jain temples. Jami mosque is a good example of a spacious structure and it is the beginning of Islamic architecture in Gujarat. Jami Masjid is believed to have been constructed from the ruins of Hindu temples and other monuments as it is mentioned in the inscription on the wall of the mosque. The 100 columns supporting roofs in the open courtyard lend support to the inscription, for these huge columns were once part of Hindu or Jain temples.

Jami Masjid, Khambhat. TrekEarth

Umar bin Ahmad al-Kazaruni, a trader of the town seems to have taken care of the mosque construction work. Lack of minarets, domes, etc in the mosque suggests that the Indo- Muslim architecture was in its early infancy here. The central arches display 'Torans', a feature native to Gujarat and the Gujarat Sultanate adopted it diligently in the structures.
The interior part of the mosque has a colonnaded open courtyard which is built with 100 columns supporting roofs built from ruins of Hindu and Jain temples.

Jami Masjid - Khambhat, Gujarat. trekearth.com,

Above image: The pillar in the image were once the part of Hindu or Jain temple. This masjid was made mostly from the ruins of temples.........................

Many compartments in the prayer hall have low domes atop and are different from those which crown the mihrab's niches. The domes have latticed windows made in the typical architectural style of Gujarat. The columns are built in two rows , each with 26 columns forming a passage that separates the wall in the front from the first row. Yet another feature is there are eight rows formed by six pillars in each row. Closer to front part, these produce 14 chambers, each topped by a dome. However, arcaded entrances to the aisle of the mosque have a flat roof. The jambs here rise to a height of about 40 feet with sharp finials at top.

Latticed window. Jami Masjid - III - Khambhat, Gujarattrekearth.com/

Above image: Jami masjid, Khambhat, Gujarat. This perforated, tiled screen (jaali) preserves the privacy of women in the women's gallery. At the same time it overlooks the qubba - the central, domed space that houses the mihrab. Do note the different patterns!.............................

Omar bin Ahmad Al Kazaruni's tomb is in the southern part of Jami Masjid; he died in 1333. It is a colonnaded hall in a square shape but with a circular inner court that contains the tomb. It is made of marble, besides, there are many smaller tomb dating back to the 14th and 15th centuries.

Tit-bits:

Jami Masjid, Khambhat, Gujarat state was once Shakunika Vihar, a Jain temple built by Princess Sudarshana. In 1299 AD Muslim ruler Alauddin Khilji of Delhi Sultanate destroyed the temple sculptures and converted it into Masjid during his raid to Gujarat.

https://en.wikipedia.org/wiki/Jami_Masjid,_Khambhat