Notable in 1988 for being the first skyscraper to be demolished in the Melbourne CBD.

https://en.wikipedia.org/wiki/CRA_Building

They installed some fancy looking but ineffective platform shelters back in 2007 as part of the EastLink project, and called it a day.

https://railgallery.wongm.com/melbourne-station-signs/F110_3765.jpg.html

Thanks for the addition Ian – which reminds me of the conversion of the main Melbourne-Adelaide line to standard gauge in 1995:

https://www.railexpress.com.au/20-years-on-a-pair-of-interstate-milestones/

I don’t recall any weekday peak period closures account constructing the city loop, at least from 1977 onwards when I started working for the Victorian Railways, travelling by train into the city each weekday. Admittedly work had started before then, so I can’t absolutely rule out closures before 1977.

Incidentally, I do recall reading about an incident before 1977 when a crane employed on loop construction work toppled over onto traction power lines near the old Flinders Street E Box. This connected traction power to signalling power, which burnt out signal cabling affecting most signals between Flinders Street and Richmond. Emergency rules were brought in to keep trains running, where instead of drivers being given written instructions by a signalman to pass a given signal at stop (which is how an unlit signal was supposed to be treated), they were given written instructions to pass /every/ signal to Richmond, because there were simply too many signals out to be able to do this for every individual signal. But they kept the trains running. (Although this probably involved clipping the points, which would have stopped some services, including affecting eastern passenger trains such as to Bairnsdale and Yarram, which in those days departed from platform 1 at Flinders Street.)

The Jolimont Rationalisation project in the late 1990s had pairs of tracks and platforms at Flinders St closed up to 4 weeks at a time, complete with temporary timetables. Big disruptions, but kept trains running through out. I suspect the City Loop works would have been much the same.