Condo.com, Houses.com and now Property.com and Properties.com.

The new owner of Property.com and Properties.com is very familiar with online real estate sites: it already owns Condo.com, Condos.com, and Houses.com.

The buyer — which owns US Condo Exchange, LLC — was revealed today in a press release.

While the release says the sales price is confidential, Rick Schwartz tweeted several weeks ago that the combined price was $4 million plus equity.

Schwartz bought the property.com domain name for $750,000 in 2005.

He thought he had a deal to sell it once before to the owner of Foreclosure.com, but the deal went sour due to the buyer’s financial troubles.

The buyer plans to launch a site at Property.com in the fourth quarter of this year.