Unqlio is currently busy setting up stores in Australia.
"Forever 21 would take a site like that. At the moment, though, we don't know if they are looking or what their appetite is. But again, they would be really good and welcomed in this market."
Other alternatives could include a conglomeration of brand families under one roof.
"What we may see is that it could be a relocation of an existing business.
"It's possibly a little bit far up for some of the premium brands, and the other aspect is that many of those premium brands will be waiting for Commercial Bay to come along."
Wilkinson hoped potential retailers would take both the vacant Queen Street and Lambton Quay stores.
"Both Wellington and Auckland are absolutely prime sites. These kinds of locations don't come along very often and so the big brands will recognise that.
"We've seen an evolution of some really interesting retail going on around Australasia at the moment with the likes of Culture Kings - it's a brand that has been really euphoric and I'd love to see Culture Kings come to New Zealand and do very, very theatrical retail."
Spanish retailer Zara which has an Auckland store in Sylvia Park mall but not a central city site, could be another contender, along with Mango or Sephora.
JLL retail consultant Chris Beasleigh said the former Topshop site may not be big enough for some international retailers.
"It may not be big enough, even though it is a big property, in terms of Auckland property and what international retailers need - it may not be big enough."
Sephora and Mango are said to be looking for a site in Auckland Central, but Beasleigh said he was not sure if they had done a deal.
"I don't think it will be available for long - there's not many sites with that kind of profile so I would say they have strong demand, and its probably just choosing the right tenant for the building," he said.
"It's a great site and a lot of the work has been done to create that corner profile when Topshop went there so for someone come in and jump into a prime corner where a lot of that work has been carried out - it's pretty much there ready to go.
"With someone who wants to make an entrance into the New Zealand market, that's a pretty good statement to make ."