Terrifying sight outside my block of flats today

Drove up the road home and was met by this - billowing smoke, 7 engines and many more ancillary ones, police and barriers and smell - ghastly smell of burnt plastic - and I wasn't allowed in my building, nor into the garage so my windows remained open and everything is going to have to be washed. It was the next door office building that had a fire on the top floor so all the ladders were up with firemen and hoses 5 storeys high. All finished now except they've had to pull the place to pieces to see that the fire isn't travelling behind boards and things and there are watchmen remaining along with the stink.