Dak Prescott has begun rebuilding in Texas ... TMZ Sports has learned construction on his new mansion in Prosper is now underway.
Check out these photos we obtained on Monday ... you can see multiple structures have been erected on the Prescott property that used to feature a multi-million-dollar house.
DEMOLITION DAK
The Dallas Cowboys quarterback, of course, knocked it down back in October ... with the hopes of putting a more modern pad in its stead. And, as you can see, QB1's dream is clearly on its way to becoming a reality.