On the second level inside the BMC building, stained-glass windows illuminate a museum which traces the evolution and history of the Municipal Corporation and the stellar role of Frederick W. Stevens in the design of the building. This museum also has a collection of old maps of the Greater Mumbai Region and old photographs of Mumbai.
The viewing gallery inside the Corporation Hall. The hall was extensively damaged in a fire outbreak and was restored in 2000-01 by conservation architect Vikas Dilawari. Visitors need to climb up a cast-iron spiral staircase to reach the viewing gallery above, an idea Stevens borrowed from the Glasgow City Chambers, in Glasgow, Scotland.
In 2018, UNESCO awarded World Heritage status to the Victorian Gothic and Art Deco ensemble of Mumbai. In its citation UNESCO noted ’Both the Victorian Gothic and the Art Deco ensembles exhibit an important exchange of European and Indian human values over a span of time. The Victorian assemblage of grand public buildings created an Indo-Gothic style by blending Gothic Revival elements with Indian elements, with adaptations in response to the local climate by introducing balconies and verandas.’
Marble statue of Mahatma Gandhi inside the Corporation Hall. Hanging from the ceiling are microphones marked with numbers for respective speakers, one of the many additions made to suit changing technology. The original stained-glass panels from the bay window have been replaced with metal plaques commemorating Mumbai's history and prominent landmarks.
Frederick Stevens raised the height of BMC to 235 feet. At the rear of the tower, he made provision for a lift shaft, making it the first building in Mumbai to use a hydraulic lift. The water which was used in running the lift was stored between the outer and inner domes of the tower. The tanks had a capacity of 40,000 litres.
Frederick Stevens’ design of large windows allowed plenty of natural light and breeze to pass through, keeping the buildings ventilated and illuminated. This was a practical necessity because at the time of its construction, buildings didn't have electricity. The BMC building was, in fact, the first building in Mumbai to be fully electrified before inauguration.
Externally placed pipes drain rainwater from the roofs during the monsoon season. The pierced wooden jalis allow for the play of light and shade in the corridors of the building. They were made by Telugu-speaking craftsmen at the JJ School of Art and were meant to provide shade during summer months and protect the corridors from rain and sunlight.
The Corporation Hall has a collection of busts and statues of prominent personalities from Indian history, freedom fighters and eminent citizens of Mumbai who contributed greatly in the development of the city. Seen here are the busts of Dr B.R. Ambedkar, Chhatrapati Shivaji Maharaj and Vinayak Damodar Savarkar.
Large framed portraits of prominent Mumbai citizens hang from the upper level of the Corporation Hall. This is Keshav Sitaram Thackeray (1885–1973), father of Balasaheb Thackeray, founder of the political party Shiv Sena. K.S. Thackeray was an author and social activist. He was also one of the key leaders of the Samyukta Maharashtra Samiti that campaigned for the creation of Maharashtra state based on linguistics and for inclusion of Mumbai as the capital of Maharashtra.
The Corporation Hall is richly detailed with moulded wooden panels covered in gold leaf. Busts of figures representing the various communities of Mumbai hold heraldic shields with the initials CB marked on them (CB stands for Corporation of Bombay). The ceiling is made of unpolished teakwood.