Google's plot behind King's Cross train station in Central London is being used for the Ambassador Theatre Group's production of The Railway Children, with tickets on sale for the next eight months.
The production, which previously ran on a disused Eurostar platform at Waterloo, will now be seen in a 1,000-seat purpose-built theatre complete with railway track at King's Cross, according to the Evening Standard.
Google's plot will be used for the production of The Railway Children Techworld/Sam Shead
Joe Borrett, Google's director of real estate, said: "Working with this production will be a great way to engage with the local community while we continue to plan our new UK headquarters."
The office, expected to be able to accommodate up to 5,000 Googlers, was approved by Camden Council in September 2013 as part of a 67-acre redevelopment of the area around King's Cross station.
But last week, Google announced that it will be moving staff into leased offices at 6 Pancas Square opposite the plot of land where the HQ is due to be built, possibly because it needs somewhere to put its ever-expanding army of Google employees.
Google will occupy all of 6 Pancras Square BNP Paribas
The Silicon Valley internet giant was initially planning to relocate staff in its Victoria and Holborn offices into the new building behind Kings Cross railway station in late 2016. This date was then pushed back to 2017. Upon realising that building work is yet to commence on the site, Techworld was informed by Google last August that there is now "no target completion date".
Google's official line on why the HQ has been delayed is that it's conducting a review of its offices worldwide. However, European director of Google for Work (previously Google Enterprise), Thomas Davies, recently said "the clock is ticking".
Google refused to comment on when it expects to start building the new UK HQ.
In addition to the HQ plot and the leased office block, Google also opened a Google Glass store in King's Cross. However, this was shut down in November last year, shortly before Google announced that it was going to stop selling the augmented reality headset.