The base blocks are much more in keeping with the Osirion and the Sphinx Temple .. the upper part is the latter part, and even Casey speaks of putting off the building of the whole until the proper time.
It may have been an Obelisk base, or similar perhaps? ... .. until we know what is within the entire thing (and even given the chance the egyptologists did not accept a radar scan of it) ... we will simply not know ... but speculation is always fun!
Beware the Adze!
Beware the land it came from.
... ... ...
That chisel of metal ~bi3 n pt~
With which he opened the mouths of the gods.