Er, no.
We can't take the existing 10k seats at GP (plus 1,500 standing places) with us to the new stadium.
Indeed, we can't do anything with GP - we've only been given dispensation to go on playing there because we're building a new stadium.
So if it is £70m (and I think it's more than that), then it works out at just over £4k per seat, all told.
Which is before you subtract the rent we will get from London Irish RFC.
And before you consider Griffin Park is currently valued at £35m - money which couldn't be accessed if we weren't moving out.
And without going deeper into the ins-and-outs of the West London property market, you might want to consider this.
Planning [permission and development funding for the new stadium was only secured because the site will also hold 900 flats (plus a hotel).
And currently, you can't get even a 1 bedroom flat in the area for less than £500k.
You might want to get your calculator out again.