As far as I can tell the “side effects” are beneficial synergies - I love having shade in parking lots for example. You should also be saving on real estate costs if you already had a primary use for the real estate.
Maybe the solar cost efficiency taken alone is reduced, but the system efficiency of the real estate use goes up as does the ownership value for the property owner.
Maybe the solar cost efficiency taken alone is reduced, but the system efficiency of the real estate use goes up as does the ownership value for the property owner.