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LAPD's sitting on a potential goldmine in the D4vd investigation ... surveillance videos from the singer's Hollywood Hills rental home that could reveal whether Celeste Rivas was there prior to her mysterious death.

TMZ has learned cops seized all the footage from multiple security cameras at the house last month while executing a search warrant. The owner of the house, Malden Trifunovic , tells us the external cameras would show anyone who went in or out of the house ... so, the footage could help cops track Celeste's movements leading up to her demise. TMZ.com

Malden says he hasn't seen any of the footage himself, because he intentionally did not have access to the cameras, to allow his renters privacy -- so, he has no idea if Celeste was ever in the house

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