The case was heard at the London Central Employment Tribunal on 24-25 November. But the panel could not make its final decision within the two days because of delays due to lost paperwork. It will now have to meet again.
Downs is claiming unfair dismissal after she was made redundant as part of the institute's restructuring following the revelation of its financial woes last year. A total of 11 staff out of 26 lost their jobs, saving the institute £300,000 a year.
During the tribunal, at which Landscape Institute chief executive Alastair McCapra and president Neil Williamson also gave evidence, the judge heard that Downs had not been considered for alternative employment in the organisation.
McCapra said: "Perhaps I should have considered [the librarian post]. It seemed to me it was dissimilar."