The New York Attorney General's investigation of the Trump Organization requires the handover of some 1,000 appraisals.
There is a June 27 deadline for complying with James' subpoenas.
The AG's subpoeanas have been fought in two New York courthouses by the real-estate services giant.
The privacy of as many as 1,000 other clients in New York and California will be at risk if the appraisals James seeks go far beyond the company's previous work for the Trump Organization.
James believes that the appraisals are crucial to her investigation.
The Trump National Golf Club in Los Angeles, 40 Wall Street in Manhattan and Seven Springs in New York are being looked at by her office.
The appraisals on the golf club and Westchester estate were used by Trump to get tax breaks.
Austin Thompson, a lawyer for the AG's office, said during a May court hearing that the properties were false attributed to someone else in order to boost their assessed values.
Between 2012 and 2015 appraisals of Trump's interest in 40 Wall Street more than doubled. The higher appraisal was used as a security.
The documents we've seen so far show that some of the people who worked on the properties made false statements.
Thompson said that they were worried about the misstatements contained in the five employees' appraisals.
James wants to compare the work done on the Trump properties with the work done on non- Trump properties.
In response to a request for comment, a company spokesman said that the company stood by the work of its appraisers.
We are working hard to comply with the court's decision.