FW Stevens submitted two coloured drawings of his design, one of its exterior and one of the Council Chamber, backing it with convincing arguments. He had visited Europe to study town halls and proposed a well-ventilated building for the municipality. Steven's new design was accepted and he was awarded the project, and Chisholm's proposal was cancelled.
Bombay Municipal Corporation commissioned Frederick W. Stevens to design a new building to hold its offices. The site offered was a V-shaped plot opposite Chhatrapati Shivaji Maharaj Terminus (CSMT, formerly Victoria Terminus) at the intersection of Mahapalika Marg (formerly Cruikshank Road) and Dadabhai Naoroji Road (formerly Hornby Road).
Bartle Frere had envisioned Mumbai as urbs primus in Indis as early as the 1840s, when he collaborated with architect Henry Conybeare for building the Afghan Church at Navy Nagar, Colaba. His vision of Mumbai as India's prime city set in motion the Gothic Revival phase, which reached its peak under his patronage and in the last decades of the nineteenth century.
Till the mid-nineteenth century, public buildings in Mumbai adopted architectural styles popular in Europe. Notable among them were the Neo-Classical and Gothic Revival styles. By the time Frederick W. Stevens started working in Mumbai, in 1869, a new eclectic form was gradually taking shape that incorporated European forms mixed with Indian elements inspired from Hindu and Islamic architecture. This new style came to be known as Indo-Saracenic.
Animal figures feature extensively on the BMC building. They are often camouflaged within the dense floral motifs on pillar capitals. The animals are found in Mumbai and provide an important local context to the buildings, representing the ecological diversity of the region. They include squirrels, owls, herons, monkeys, snakes, peacocks, rats and other animals.
Frederick Stevens incorporated a double dome inside the main tower of the BMC building. The outer dome is visible from the street, but the inner dome is visible only from the entrance hall when the visitor looks up. The inner dome was inspired by the Gol Gumbaz at Bijapur. However, spanning just 45 feet in diameter, the inner dome is much smaller in scale compared to the Gol Gumbaz, which is the largest unsupported dome in India.
Though they are mistaken as lions, the 'lions' at the BMC building are chimeras—a mix of various animals—hence they appear with wings and a serpentine tail. The chimera has been attributed to the British dominance over land, sea and air. However, it is more likely that the motif was inspired from the flag of the Republic of Venice, which featured winged lions, one of the many elements Frederick W. Stevens incorporated from Venetian Gothic architecture.
The entrance lobby is a confluence of raw materials used in construction of the BMC building. The doorways are flanked by marble colonnettes with decorative floral capitals. In addition to iron gates, a variety of security systems are now installed here. Nowadays, this is the entrance through which visitors are screened and allowed inside the building.
Gargoyles are another design element Frederick W. Stevens incorporated from Venetian Gothic architecture. Gargoyles, chimeras and griffons became very popular motifs in cathedrals, churches and castles in the Middle Ages in Europe. In Mumbai, they appear extensively in many of Stevens’ buildings, notably more at CSMT. At the BMC building, they are used sparingly, perched on top of turrets.
The foundation stone for the BMC building was laid on December 19,1884, by the Viceroy, the Marquis of Ripon. The commemorative plaque can be seen inside the BMC building at the entrance lobby. However, work on the site started five years later, on April 25, 1889. After four years of construction, BMC building was finally completed on July 31, 1893.