Contemporary meets old in rehabilitating historic buildings

Protection of architectural heritage is a very delicate mission that needs to be supported by big set knowledge and experience. Adding new, dissimilar element historic building importance in rehabilitation process particularly disputed addressed with even more research justification. Contrasting styles one can controversial matter. In some cases, modern additions successfully preserve the originals while bringing something fresh creative, others fail do so. The main question is: does current trend adding extension architecture monument distinctly mean it obliterated, or mixture contemporary old buildings produce good architecture?