Charlie Sheen -- Gets Offer on Brooke Mueller's House, But Could Cost Him $2 MILLION

Charlie Sheen is one step closer to kicking Brooke Mueller's ass out of the house he bought for her -- TMZ has learned a real estate firm wants to buy the pad, but at such a discount ... Charlie would have to be desperate. Oh wait, he is.

TMZ obtained a copy of the letter Dginger Group fired off to Sheen's people offering $2,599,000 for the house ... along with a guarantee to close the deal in less than 7 days.

As we previously reported ... Sheen told Brooke he wants her out NOW, and even sent her a letter saying he's aggressively trying to sell the place.

But here's the rub -- Charlie bought the house for around $4.8 mil ... which means he'd be taking a massive $2.2 million bath if he accepts the current offer.

Our sources say Sheen's willing to sell at a reduced rate, but this might be pushing it.