The Hard Rock Hotel-Casino has cancelled its massive condo expansion on the apartment complex behind the hotel, reports the Las Vegas Review-Journal. But this is not the usual kind of condo cancellation.

Unlike all those that have not penciled out because there aren't enough people looking for luxury apartments that close to the Strip, this one is on hold because of the unsolicited offer from a mystery buyer. Of course, the Hard Rock condos weren't exactly doing land office business.

Owner Peter Morton says the land the adjoining the property will be part of the sale but the prospective buyer has to decide what s/he will do with the land.

That fits with the gossip over the last couple of days that the buyer is not a fan of the condo business model and wouldn't build them if and when the deal goes through.

That leaves the big question of who has a spare $1 billion lying around to buy another name-brand casino. Is another big operator trying to diversify his portfolio? Most of the likely suspects are focused on Macau, but … who was it that announced a big stock sale last week? Hmm.