Planning Minister Richard Wynne has intervened to grant special conditions for a Spring Street tower proposed by a property fund chaired by the son of former Labor premier John Cain.

Industry fund ISPT has senior officials from unions, including the CFMEU on its board.

The now defunct Elms Family Hotel on Spring Street that is to have a 22-level tower built above it. Credit:Vince Caligiuri

The fund - chaired by James Cain - last week lodged plans for a striking 16-level office tower on the corner of Spring and Little Lonsdale streets.

But the $75 million tower does not comply with strict new CBD planning rules brought in by Mr Wynne last year.