While there might be several accomplished real estate professionals under 40, it is challenging to definitively determine the top 10 real estate moguls as it depends on various factors such as net worth, deal volume, and overall industry influence. However, here are a few young and successful real estate moguls who have made their mark in the industry:

1. Jared Kushner – Co-founder and former CEO of Kushner Companies
2. Charles Kushner – Founder of Kushner Companies, Jared Kushner’s father
3. Michael Rubin – Founder and CEO of Kynetic and Fanatics
4. Ryan Serhant – Real estate broker and star of Bravo’s “Million Dollar Listing New York”
5. Frank McCourt – Real estate developer and former owner of the Los Angeles Dodgers
6. Sam Zell – Chairman of Equity Group Investments
7. Elie Horn – Founder and President of Cyrela Brazil Realty
8. Don Peebles – Founder, Chairman, and CEO of The Peebles Corporation
9. Ben Shaoul – President of Magnum Real Estate Group
10. Zaya S. Younan – Founder and CEO of Younan Properties

Please note that this list is not exhaustive, and there may be other remarkable young real estate professionals deserving recognition.