ITV News has learned 14 companies are in talks with the Jersey Development Company about leasing space in the new Finance Centre.
The details were confirmed by Assistant Economic Development minister Deputy Murray Norton who revealed two of those firms are at advanced stages with early outline agreements signed.
It comes as pressure grows on the States-owned quango to prove there is a need for the government-backed development of 'grade A' office space in St Helier.
Opponents say the proposed buildings on the Esplanade would be a blot on the landscape, not an effective use of public money, and should be something the private sector should provide instead.
A public protest is planned on the site.
Jersey's Treasury Minister says people will get straight answers. But he said details about UBS moving in were "commercially sensitive".
UBS has agreed to lease part of the controversial new development. Earlier this week an appeal against the planning consent was launched.