Robinson is building the store, he'll rent it to whomever will have it, currently Tesco. The money for Pompey was effectively a bribe to allow him to build the new store next to the stadium..
Doesn't work like that, we wanted to build an extension and wanted to know approximately how much it would cost so we phoned a few builders, they all said that we had to have architect drawings before they could even start estimating. So we gave up and moved....