day night cycle on building

hey guyes i m making a real life type game so there may be some cities and so there shall be buildings i added many buildings in the game during the day time they look good but during night cycles it dosen't match so can anyone tell me what shall i do should i add light,texture or something so even during night the building should look nice with lights? And for building texture material shall i use diffuse shader or any other would look better?.....waiting for answer....thankyou!