But a painstaking seven-year project has transformed the century-old building in Mumbai from a crumbling wreck in danger of collapse to an ornate replica of its 1916 glory days, albeit with some important updates.
"One of the biggest challenges was bringing in modern acoustics, sound, lighting and air conditioning, all the requirements of a 21st century theatre, while ensuring it didn't jar with restoring a listed interior," architect Abha Narain Lambah told AFP.
The Royal Opera House was built in a Baroque style complete with Italian balustrades, marble statues, crystal chandeliers and a gold ceiling. It was inaugurated by Britain's King George V in 1911 and completed in 1916.
Only operas were performed on stage for its first two decades -- entertainment for the Indian elite and British administrators involved in the running of the empire.
When films started to become popular, the venue, which lies near the popular Girgaum Chowpatty beach in the city's south, was altered to double-up as a cinema.
As Bollywood captured popular imagination, it soon became the place for the city's wealthy to watch the latest hit. It could also have inspired a generation of actors -- superstar Amitabh Bachchan fondly recalls watching movies there as a child.
It showcased productions from talent such as actor Prithviraj Kapoor and Marathi star Bal Gandharva.
The property was bought by the Maharaja of Gondal, a royal family from nearby Gujarat, in the early 1950s, a few years after India gained its independence from Britain.
And yet it could not maintain its appeal -- by the 1980s the venture was struggling financially and the building was in urgent need of repairs.
"The Indian cinema industry was going through one of its worst phases due to video piracy. People literally stopped going to cinema halls to watch movies.
"Most theatres shut down as there was no income to even meet daily costs. So there was no scope for any upgradation," the opera house's director, Ashish Doshi, told AFP.
It closed in 1993, and sat crumbling for years. It was put on the World Monuments Fund list of endangered buildings. The royal family of Gondal decided they would rather see it brought back to life than consigned to history.
In 2009 they commissioned Lambah, an Indian architect specialising in conservation, to lead the mammoth restoration project. It took her team two years just to stabilise the structure.
"You had these amazing steel girders that had corroded to a level where they were flaking off with a nail. The jack arches were structurally unstable and there were sections of the basement that were verging on collapse.
"The first priority was making sure the building was safe, that the overhanging balconies weren't leaning any more, that the cracks were stitched," Lambah explained.
Over the years the Baroque interiors had been replaced to give the venue an Art Deco feel with balconies dismantled and original colours painted over, posing another challenge for Lambah.
She sifted through old photos, watched video clips and listened to audio recordings to piece together exactly how the building looked in 1916.
Chandeliers, stain-glass windows, old ceramic British Minton tiles, and a domed ceiling with paintings of famous writers have all been exquisitely restored.
The cosy 574-seater venue held its first event in 23 years in October, hosting the opening ceremony of the Mumbai film festival with Bollywood star Bachchan in attendance.
December will see the start of regular events with opera, music, theatre and panel discussions planned.
"It's a magical space. It's for everyone to enjoy, not just the chosen few," Asad Lalljee, the opera house's curator, told AFP.