50 Cent had been trying to sell  Farmington, Connecticut mansion since 2007

He bought the 21-bedroom, 25-bathroom home from Mike Tyson for $4.1 million in 2003 and then did between $6 and 10 million in renovations on the property.

50 initially listed the mansion for $18.5 million but got no bites. After his bankruptcy, he tried for $8.5 million. That didn't work either, despite some false alarms.

He finally sold 50,000-square mansion for $2.9 million, a pretty massive loss.

So much so, he doesn't even want the money. Sources tell TMZ he will donate it to the G-Unity Foundation, which provides grants to non-profit organizations that focus on improving the quality of life for low-income and underserved communities across the country.

Which is a good way to make lemonade out a quite the big fat real estate lemon.