In 1969, The Beatles attended a Christmas party at Apple Corps. The previous year, George Harrison had invited the Hells Angels to a party that quickly devolved into chaos. At the 1969 party, audio engineer Geoff Emerick worried the night would end in horrible tragedy. The studio was under construction, and as the night wore on, he became increasingly — and rightfully — concerned that the floor would collapse under the partygoers.
At the end of 1969, Apple Corps was under construction. The corporation hosted the Christmas party just after the demolition phase of the project, much to Emerick’s concern.
“The most memorable thing about the 1969 Christmas bash was that it nearly marked the end of Apple … literally,” Emerick wrote in his book Here, There and Everywhere: My Life Recording the Music of the Beatles. “The demolition phase of the studio project had been completed by then, although the construction had not yet begun. As you gazed out the window from the second floor, where the party was being held, you looked straight down into this pit, this great gaping hole where the basement had once been.”
Source: Emma McKee/cheatsheet.com