Sanjay Shah a Chicago technology entrepreneur has purchased a 15,000 sq.ft. 89th floor penthouse in Trump Tower for $17 million, the priciest residential real estate transaction in Chicago's history. His father asked what he plans to do with the property, as Shah already lives in a sprawling 10,000 sq ft home in Chicago's South Barrington with his wife and two daughters. Shah said he is not going to move from his current residence which is minutes away from his office, but he may use the penthouse as a second home or a guest house to host his friends and clients, and as a venue for fundraisers and philanthropic activities. He believes the purchase was a good deal. Deal making comes naturally to Shah, a self made man whose software company Vistex is personally bootstrapped and privately held. He went to the US in 1988 to get his MBA at Lehigh University after graduating from Mumbai's Sydenham College. Unhappy with his job as an accountant at Pricewaterhouse Coopers, he joined General Motors in Canada before moving to Germany's software giant SAP and he eventually became an independent provider and collaborator with the company. "I'm an Indian at heart, an American in my mind and an internationalist at work," says Shah. His company employs 400 workers in North America and 300 each in Europe and India.