Up to 400 property syndicators with investor funds worth $2 billion will have to reveal more information under new rules.
From October 1, they must issue a prospectus, investment statement and appoint a statutory supervisor, the Financial Markets Authority said yesterday.
Up until now, they have operated under Securities Act exemptions demanding fewer documents, but the authority said the schemes generated a significant number of complaints from investors so the rules had to get tougher.
Finance company collapses sparked a big syndication drive, as investors were drawn to big returns, often double bank interest rates.
Sue Brown, the authority's head of primary regulatory operations, warned of "significant risks" around the syndicators who operated property proportionate ownership schemes.