A ittle about asbestos here....
"Asbestos in the building" can mean many different things. Asbestos was, at one time, used in many different products- from floor tile to decorative wall textures.
Asbestos is a hazard, in that small fibers, of the right size and xhape, can enter into the tiniest corners of the lungs, where the irritation that they cause results in almost microscopic cysts....many of which become cancerous.
A contractor typically knows just where the asbestos is, and takes measures to reduce the risks. For example, in removing an asbestos-containing texture, the area is often wetted down to reduce fibers in the air.
Asbestos trapped in a material, such as that embedded in asphalt flooring, typically presents almost no risk, as it is virtually impossible for the fibers to become airborn.
A lot of things as erroneously identified as "asbestos" by the well-intentioned. For example, the fuuzzy, fiberous stuff applied to I-beams for fire protection is usually a cement product, and does not contain asbestos- though many will think it does.