This followed a promise by National Security Minister Gary Griffith to relocate 100 employees by the end of next month to the Port of Spain Waterfront and One Alexandra Place.
However Public Services Association President Watson Duke claimed that the doors would not remain open if the promise to move the employees was not kept.
Until such time, the Immigration Office will open at 7 a.m. and close its doors at noon every day.
Duke stated that obligations agreed to by Griffith at a meet¬ing on Wednesday evening, also promised employees starting at the end of June, a $1,000 non-taxable allowance for immi¬gration officers, similar to that being offered to police officers.
He said Griffith has assured the union a note will be taken to Cabinet next Thursday on the allowance.
He has asked for an occupational health and safety evaluation of the place and also testing for employees who have been exposed to polluted conditions.
The closures have led to an outcry from some business quarters that Government must ensure Occupational Safety and Health Act (OSHA) compliance as shut-downs of State offices at that level have a negative effect on the economy.