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Phil Spector just filed a lawsuit from BEHIND BARS — claiming the house where he murdered actress Lana Clarkson in 2003 is being destroyed by a local government construction project … and now, he’s suing.

Phil and his wife filed the lawsuit today in L.A. County Superior Court against the City of Alhambra — where his wife currently resides … while Phil rots away in prison.

According to the lawsuit, the city commissioned a construction project on the hill where Phil’s house is located — a project that has since caused the retaining wall that supports the hill to start cracking.

As a result of the cracked wall, Phil claims there have been landslides and land-sinking problems — causing significant damage to his house.

Phil is suing for unspecified damages to cover the massive repair costs — as well as compensation for loss of property value.

Back in 2009, Phil was convicted of shooting Lana Clarkson in the foyer of the house … even though he was adamant Clarkson shot herself.  He’s currently serving a sentence of 19 years to life.

We called the City of Alhambra for comment — so far, no response.