im attaching two test redering with slight different light source. rendered time for th first image is about 32 minutes and the second one is about 35 minutes. the first one has only one big LEM 25%. i also used Omni's 15% to lighten up the balconies and below the big tile roof.
the second is the same I TURN THE SHADOWS ON (light 80, dark 20)
the last one was the adjustment of background color to slightly Medium gray. this to make my backgrond slightly dark and to compensate on the harsh light in combining LEM and sunlight.