The daughter of the founding family of General Growth Properties has filed a monster lawsuit against Neal, Gerber & Eisenberg, alleging the Chicago-based firm created a bewildering mix of investment vehicles through which they mismanaged her trust fund — costing her at least $300 million.

Schiff Hardin is representing the plaintiff, Mary Bucksbaum Scanlan, the 40-year-old daughter of Martin Bucksbaum, who co-founded the real estate empire that peaked with the creation of General Growth Properties. (General Growth, which bought up malls all over the country, filed for bankruptcy in April).