Smoke from a three-alarm fire that gutted the city’s Chamber of Commerce building continued to billow lightly, and firefighters sprayed water from hoses on stubborn hot spots early Thursday afternoon after an overnight blaze that was noticeable for miles. The raging fire at 100 Lafayette Circle in the upscale downtown area sent embers high into the sky and destroyed more than a half dozen businesses, including La Finestra restaurant. Observers as far away as Pittsburg could see smoke in the early morning sky, and people smelled the smoke from as far as two miles away.