Conclusion
Some Egyptologists propose that Khufu (2551-2528 BC) or Djedefre (2528-2520 BC) built the Sphinx. The archaeological evidence shows, however, that Khafre’s builders:
Completed Khafre’s Valley Temple with its granite casing.
Built a northern enclosure wall for the Valley Temple that clearly respects the Temple’s granite casing.
Built the Sphinx Temple, incorporating the northern Valley Temple enclosure wall.
Built the Sphinx Temple with blocks geologically linked to the Sphinx quarry.
Abandoned work on the Sphinx Temple and Sphinx quarry shortly before either were completed, indicating they were the last elements to be added to the project.
Furthermore, Djedefre ruled for a relatively short time and built his funerary complex north of Giza at Abu Roash.

Small ivory statue of King Khufu
(Cheops), builder of the largest
pyramid at Giza.
Found at Abydos in 1903 during
excavations by Flinders Petrie.
Height - 7.5 cm.
Old Kingdom - 4th Dynasty.
No matter what might be proposed about the giant Sphinx face resembling the only known image of Khufu (a tiny ivory figurine in the Egyptian Museum), and no matter how much the Sphinx fits some Egyptologists’ ideas that Khufu identified himself as the sun god, the Sphinx is integrated with, but later in sequence, than the other Khafre monuments, making Khafre the most probable candidate as the Sphinx’s owner.
http://www.aeraweb.org/khafre_structures.asp