In fact, he stopped using the house some time after the death of Mme de Pompadour. It's difficult to say when exactly, but it was sold off in 1771. I don't think it was ever the harem of popular imagination, more of a bed and breakfast establishment!
In the immortal words of Nancy Mitford, the Parc aux Cerfs was “a modest little private brothel, run on humane and practical lines.” 
KILLING! How I love Nancy Mitford. I wish that I had my copy of her biography of Pompadour to hand - I should have known that she would have a great take on the Parc aux Cerfs.
As I recall, the Parc establishment, a small house within the environs of the town of Versailles, was initiated by Pompadour in order to cater to the King's needs and to relieve her of this burden to a degree, as her physical needs had never been a match for his, even when she was in good health. It is disputed as to whether Louis actullay visited the house himself, or whether its inmates were brought to the palace when required.........
The brothel removed any chance of a new favourite supplanting her as maitresse-en-titre and ensured that the King's health was not impaired by contact that might endanger him. I believe that Louise O'Morphy, immortalised by Boucher, was one of the inmates of this establishment and that most of its inhabitants did quite well out of the arrangement, receiving dowries and pensions. For those that gave birth to the King's children, marriages were arranged with members of the King's Household, who would then accept paternity of the child.
There is also a theory that Mme Du Barry also started out as an inmate of the little house, before asuming her powerful position of maitresse-en-titre........