Beauchief Post Office Sheffield

I came across this postcard recently that shows the old post office at Beauchief (Sheffield). It was on the corner of Abbey Lane and Abbeydale Road South, opposite the former Beauchief Hotel (Abbeydale Station Hotel)

The site is now occupied by a set of mundane flats/apartments and before those were built, it was a garage forecourt.

There is no date on the postcard but it looks as though it was taken in the inter-war period. The tram tracks are visible and there are no motor vehicle in sight!.

The post office was still there in June 1964. There is a copyrighted photograph on Picture Sheffield that shows the building but the tram tracks had been taken up by that time.

I would like to know when the post office demolished, and more importantly for what reason.