Glass fell from the Sick Kids Centre for Research and Learning for the second day in a row on Thursday morning.

Bay St. was closed between Elm St. and Walton St. around 5:30 a.m. when the glass fell from a window on the fifth floor of the building.

Cpt. David Eckerman from Toronto Fire Services said that it fell from about 50 feet up.

The road was closed for nearly two hours, causing traffic and TTC routes to divert as police investigated and cleaned up the scene.

Falling glass is a frequent issue in the downtown core.

It was the subject of two $20-million class-action lawsuits in 2012, when shattered glass incidents prompted developers at Murano Towers on Grosvenor St. and Festival Tower on John St. to seal residents’ balconies.

The lawsuits alleged that builders were negligent in the installation and manufacturing of the glass panelling.

The Shangri-La hotel and condo building on University Ave. also had a recurring problem with falling glass, leading to the City of Toronto ordering the hotel to ban guests from its balconies and construct barriers over sidewalks in 2014.

Shattered glass plummeted from five balconies at the Shangri-La over two years. A man was injured in one incident, and in another, a pane shattered on University Ave. during the morning rush hour.

Balcony glass at a handful of downtown condo buildings exploded in summer 2011, causing minor injuries. Developers using the same supplier then installed protective mesh on their terraces as a safeguard.

The issue prompted the provincial government to raise building code standards in 2012.

Over the years, glass shards have also rained down from Trump Tower and the RBC Tower, among many others.