Mansion on Indian Creek Island, Miami. The Alexander Team | Douglas Elliman

An estate on Indian Creek Island sold for $50 million, making it the most expensive single-family home ever sold in the Miami area, according to people familiar with the deal. The property, at 3 Indian Creek Island Road, was not officially listed but had sold in 2012 for $47 million. At the time, that marked a record for the most expensive home ever sold in Miami-Dade County. So with the current sale, the home will have set the Miami record twice.

The sale comes as the real estate market in South Florida has gotten off to a strong start for the year, helped in part by the new tax law that makes it more attractive to live in low-tax states. The names of the buyer and seller of the Indian Creek property weren't disclosed. The buyer of the property in 2012 was an LLC, and was purchased by a Russian businessman, according to news reports.

Mansion on Indian Creek Island, Miami. The Alexander Team | Douglas Elliman

The ultra-modern home stretches over 20,000 square feet on 2 acres overlooking Biscayne Bay. It has 10 bedrooms, 14 bathrooms, a 3,000-square-foot master suite, rooftop lawn, chromotherapy spa, a 3D movie theater and two kitchens. It also has a 100-foot swimming pool. The transaction was brokered by Tal Alexander and Oren Alexander of Douglas Elliman. The question of whether the sale will officially be the most expensive ever in Miami will remain a source of debate. Ken Griffin, the Chicago-based hedge-fund manager, bought two apartments — a penthouse and unit below — in the Faena House in 2016 for $60 million. But that sale was for a condo, and the Indian Creek home is a record for a single-family home. The Alexanders represented the seller, and Ralph Arias of ONE Sotheby's represented the buyer. Griffin never combined the two units, and they are now for sale.