From what I remember, nothing. The minimum required Acc spaces, cycle spaces and thats it it joins on exiting parking on Alan Turner way. There is a 100+ page transport assessment that effectively justifies this, all the different public transport routes available, and this is not uncommon in urban settings.
Remember that there was an approval in place from 2014 as well as part of the south stand, and the infrastructure is largely there for the stand, which included a future north stand capacity and this is not an increase on that.
I'd have to look at it again for any more detail than that though, and it was some time ago so might need a memory refresh.
Edit, just had a quick look at the TA.
'No additional parking will be provided for the hotel or workspace use and those staff and visitors will be required to use existing on site parking. Around 150 spaces will be allocated for users of the hotel'.