20 Peachtree Court

A nearly vacant, bank-owned mixed-use building near Long Island MacArthur Airport — 40,000 square feet on a single story, originally built in 1983 and acquired in 2003 for $650,000.

After roughly $200,000 in cosmetic upgrades and aggressive marketing, the property was fully leased to a roster of office and research-and-development tenants. Sold three years later in 2006 for $3.2 million — a 203% return.