For his day job, Karun Vij earns $183,000 as a regional sales manager for an automation supplier. But before the age of 33, he has also amassed four properties, worth over $2.3 million. His ah-ha moment came about in college, when he realized the value of buying up student rentals -- and he doesn't plan to stop any time soon.

This is an installment of CNBC Make It's Millennial Money series, which profiles people across the globe and details how they earn, spend and save their money.

Produced and Edited by: Raffi Paul
Senior Managing Producer: Eric M. Clark
Camera: Jeremy Applebaum
Animator: Elham Ataeiazar
Reporter: Mike Winters
Additional Footage: Getty Images, Karun Vij

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I Live On $183K/Year & Own Four Rental Properties Worth $2.3 Million | Millennial Money