Mortgage Co. to La Toya -- Pay Up or 'Beat It'

La Toya Jackson is days away from losing her Las Vegas home -- unless she comes up with enough cash to pay the mortgage by the end of the month.

According to legal documents obtained by TMZ, La Toya owes $745,670.27 on her swanky condo in the Regency Towers of the LV International Country Club.

The docs show the house will go up on the auction block if she doesn't pay up.

The Clark County Recorder's office tells us the auction was originally schedule for August 31 -- but it was postponed. The new auction date is September 30.

La Toya's rep gave us this statement:

"La Toya has an extensive real estate portfolio and her advisors directed her to the business decision to let this particular property to go to short sale where it is now.

The property was also something she got during her divorce from Jack Gordon and she has no attachment to it."