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The owner of the Hollywood Hills home D4vd was renting has hired a private eye to get to the bottom of what happened inside the house ... because LAPD has not publicly released any answers 6 whole weeks after Celeste Rivas ' decomposing body was found in D4vd's Tesla.

Mladen Trifunovic owns the home D4vd's manager was renting -- the place has been searched by cops as part of the Celeste death investigation -- and he says a P.I. is now involved. Play video content

LAPD raided the home last month and our sources told us they were looking for blood evidence ... but there's been no updates on where the case stands.

The Tesla was parked near the home and it was towed to a Hollywood impound lot ... and after a few days at the tow yard, cops were called for a foul stench

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