Ceresney: Let me just understand that a little. You said your net worth goes up and down based upon your own feelings?
Trump: Yes, even my own feelings, as to where the world is, where the world is going, and that can change rapidly from day to day ...
Ceresney: When you publicly state a net worth number, what do you base that number on?
Trump: I would say it's my general attitude at the time that the question may be asked. And as I say, it varies.
But the deposition shows Trump's valuation of his properties can be at odds with others' views.
"Donald owns 40 Wall Street, which he spent about $35 million to buy and refurbish in 1996," lawyer Ceresney read from O'Brien's book. "The building has about $145 million in debt attached to it, and New York City assessors value it at $90 million. Donald values it at $400 million."
Trump reacts to the passage by saying: "Anybody would understand that a city assessment is 15 and 20 percent the value of a building."
When questioned about the return on his investment from several golf courses, Trump said he does his own math.
Donald Trump net worth: I'm worth whatever I feel - Apr. 21, 2011