The notable structures built by Firuz Shah on the eastern and northern side of the reservoir consisted of the Madrasa (Islamic School of Learning – a theological college), the small Mosque, the Main tomb for himself and six domed pavilions in its precincts, which were all built between 1352 and 1354 A.D.
Madrasa
Established in 1352, the Madrasa was one of the leading institutions of Islamic learning in the Delhi Sultanate.
It was also considered the largest and best equipped Islamic seminary anywhere in the world.
There were three main Madrasa's in Delhi during Firuz Shah's time.
 One of them was the Firuz Shahi madrasa at Hauz Khas.
After the sacking of Baghdad, Delhi became the most important place in the world for Islamic education.
The village surrounding the Madarsa was also called Tarababad (city of joy) in view of its affluent and culturally rich status, which provided the needed supporting sustenance supply system to the Madrasa.

The madrasa structure has an innovative design.
It was built in L-Shape as one contiguous structure on the south and east edges of the reservoir complex.
One arm of the L-shape structure runs in the North–South direction measuring 76 m (249.3 ft) and the other arm runs in the East–West direction measuring 138 m (452.8 ft).
The two arms are pivoted at the large Tomb of Firuz Shah (pictured).
At the northern end there is a small mosque.
Between the mosque and the tomb two storied pavilions exist now on the northern side and similar pavilions on the eastern side, overlooking the lake, which were used as madrasa.
The two arms are interconnected through small domed gateways passing through the tomb at the center.
The North–South arm with balconies overlooking the reservoir is a two storied building with three towers of varying sizes.
Ornamental brackets cover the upper storied balconies while the lower stories have corbelled support.
Roof overhangs or eaves (chajjas) are seen now only in the upper stories though it is said that they existed on both stories when it was built.

From each floor of the Madrasa, staircases are provided to go down to the lake.
Many cenotaphs, in the form of octagonal and square chhatris are also seen, which are reported to be possibly tombs of teachers of the Madrasa.


It is recorded that the first Director of the Madarasa was 
one Jalal al-Din Rumi who knew fourteen sciences, could recite the Quran according to the seven known methods of recitation and had complete mastery over the five standard collections of the Traditions of the Prophet
The madrasa was well tended with liberal donations from the Royalty.
Timur, the Mongol ruler, who invaded Delhi, defeated Mohammed Shah Tughlaq in 1398 and plundered Delhi, had camped at this venue.
Expressed in his own words, his impressions of the tank and buildings around Hauz Khas were vividly described as:
When I reached [the city’s] gates, I carefully reconnoitered its towers and walls, and then returned to the side of the Hauz  Khas.
This is a reservoir, which was constructed by Sultan Feruz Shah, and is faced all round with stone and stucco.
Each side of the reservoir is more than a bows–shot long, and there are buildings placed around it.
This tank is filled by rains in the rainy season, and it supports the people of the city with water throughout the year.
The tomb of Sultan Firuz Shah stands on its bank
While his description of the place is correct but his ascribing construction of the tank to Firuz Shah was a misconception.

Pavilions
The madrasa is flanked by the reservoir in the northern front and by a garden on its southern side at the second floor level.
The entry to the garden is from the eastern gate which paases through the Hauz Khas village.
The garden houses six impressive pavilions.
The pavilions with domes are in different shapes and sizes (rectangular, octagonal and hexagonal) and on the basis of inscriptions are inferred to be graves.
A cluster of three hemispherical domes, a large one of 5.5 m (18.0 ft) diameter and two smaller ones of 4.5 m (14.8 ft) diameter, portray exquisite architectural features of
The notable structures built by Firuz Shah on the eastern and northern side of the reservoir consisted of the Madrasa (Islamic School of Learning – a theological college), the small Mosque, the Main tomb for himself and six domed pavilions in its precincts, which were all built between 1352 and 1354 A.D.
Madrasa
Established in 1352, the Madrasa was one of the leading institutions of Islamic learning in the Delhi Sultanate. It was also considered the largest and best equipped Islamic seminary anywhere in the world. There were three main Madrasa's in Delhi during Firuz Shah's time.  One of them was the Firuz Shahi madrasa at Hauz Khas. After the sacking of Baghdad, Delhi became the most important place in the world for Islamic education. The village surrounding the Madarsa was also called Tarababad (city of joy) in view of its affluent and culturally rich status, which provided the needed supporting sustenance supply system to the Madrasa. 
The madrasa structure has an innovative design. It was built in L-Shape as one contiguous structure on the south and east edges of the reservoir complex. One arm of the L-shape structure runs in the North–South direction measuring 76 m (249.3 ft) and the other arm runs in the East–West direction measuring 138 m (452.8 ft). The two arms are pivoted at the large Tomb of Firuz Shah (pictured). At the northern end there is a small mosque. Between the mosque and the tomb two storied pavilions exist now on the northern side and similar pavilions on the eastern side, overlooking the lake, which were used as madrasa. The two arms are interconnected through small domed gateways passing through the tomb at the center. The North–South arm with balconies overlooking the reservoir is a two storied building with three towers of varying sizes. Ornamental brackets cover the upper storied balconies while the lower stories have corbelled support. Roof overhangs or eaves (chajjas) are seen now only in the upper stories though it is said that they existed on both stories when it was built.
From each floor of the Madrasa, staircases are provided to go down to the lake. Many cenotaphs, in the form of octagonal and square chhatris are also seen, which are reported to be possibly tombs of teachers of the Madrasa.

It is recorded that the first Director of the Madarasa was 
one Jalal al-Din Rumi who knew fourteen sciences, could recite the Quran according to the seven known methods of recitation and had complete mastery over the five standard collections of the Traditions of the Prophet
The madrasa was well tended with liberal donations from the Royalty.Timur, the Mongol ruler, who invaded Delhi, defeated Mohammed Shah Tughlaq in 1398 and plundered Delhi, had camped at this venue. Expressed in his own words, his impressions of the tank and buildings around Hauz Khas were vividly described as:
When I reached [the city’s] gates, I carefully reconnoitered its towers and walls, and then returned to the side of the Hauz  Khas. This is a reservoir, which was constructed by Sultan Feruz Shah, and is faced all round with stone and stucco. Each side of the reservoir is more than a bows–shot long, and there are buildings placed around it. This tank is filled by rains in the rainy season, and it supports the people of the city with water throughout the year. The tomb of Sultan Firuz Shah stands on its bank
While his description of the place is correct but his ascribing construction of the tank to Firuz Shah was a misconception.
Pavilions
The madrasa is flanked by the reservoir in the northern front and by a garden on its southern side at the second floor level. The entry to the garden is from the eastern gate which paases through the Hauz Khas village. The garden houses six impressive pavilions. The pavilions with domes are in different shapes and sizes (rectangular, octagonal and hexagonal) and on the basis of inscriptions are inferred to be graves. A cluster of three hemispherical domes, a large one of 5.5 m (18.0 ft) diameter and two smaller ones of 4.5 m (14.8 ft) diameter, portray exquisite architectural features of 
Hauz Khas Complex