Architectural conservation describes the process through which the material, historical, and design integrity of mankind's built heritage are prolonged through carefully planned interventions. The individual engaged in this pursuit is known as an architectural conservator. Decisions of when and how to engage in an intervention are critical to the ultimate conservation of the immovable object. Ultimately, the decision is value based: a combination of artistic, contextual, and informational values is normally considered. In some cases, a decision to not intervene may be the most appropriate choice.
Architectural conservation deals with issues of prolonging the life and integrity of architectural character and integrity, such as form and style, and/or its constituent materials, such as stone, brick, glass, metal, and wood. In this sense, the term refers to the "professional use of a combination of science, art, craft, and technology as a preservation tool"  and is allied with its parent fields, of historic environment conservation and art conservation.
In addition to the design and art/science definition described above, architectural conservation also refers to issues of identification, policy, regulation, and advocacy associated with the entirety of the cultural and built environment. This broader scope recognizes that society has mechanisms to identity and value historic cultural resources, create laws to protect these resources, and develop policies and management plans for interpretation, protection, and education. Typically this process operates as a specialised aspect of a society's planning system, and its practitioners are termed historic environment conservation professionals.
TATE MODERN, LONDON, ENGLAND, 1994
The building offers space, but it is not suitable for art, it offers shelter,but it leaks and has to be repaired,it offers a location,but that is also problematic,it offers a beginning, a presence, which could be hard to organize working within contemporary parameters.
TATE MODERN, LONDON, ENGLAND, 1994
Located between the city centre and Heathrow Airport, just outside the congestion zone, the site forms the most Western of all development locations, the last and currently the missing link in a chain of developments that encircle central London.
At present, the area is a vacant strip of land: a 43 acre breach in the urban fabric. It borders the divide between some of the wealthiest areas in London and some of London's most notorious and deprived housing estates. Hinging between the two extremes, the site has the potential to mediate the divide.
APRAKSIN DVOR, RUSSIA, ST. PETERSBURG, 2007
Consisting of multiple freestanding buildings arranged within the market yard, Apraksin Dvor represents a unique urban typology in the historic center of St. Petersburg. The exceptionality of the site that makes it prime for preservation is also the most advantageous aspect for development.What future can be imagined for this area? Is it possible to resist the default treatment of inner city areas: to avoid an uncompromising regime of preservation – no room for maneuvering in the name of authenticity – without surrendering to the forces of commercial exploitation?
BOVISA MASTERPLAN, ITALY, MILAN, 2007
With the rapid growth and expansion of urban centers in the latter half of the 20th century, industrial sites, formerly located on the city’s periphery, now find themselves encompassed by the ever expanding urban fabric of the city. Paralleling this growth has been a shift in the main economic drivers of the city from industrial production to service industries. Consequently, what were once vital elements of the city have gone fallow.Milan, once the center of Italy’s industrial region, is today Italy’s leading financial center and a global center for fashion and design. Currently experiencing a boom of urban redevelopment, the city’s post-industrial urban voids now provide exceptional opportunities for ambitious architectural and urban innovation.
BEIJING CENTRAL BUSINESS DISTRICT , CHINA, BEIJING, 2003
O.M.A.’s CBD Core proposal evolved from the observation that the tower has made the Central Business District into a structure that is identical everywhere. At the same time, however, global economic pressure and extraordinary advances in information technology have dramatically changed the nature of office work. The increasing ubiquity and mobility of information technology paradoxically stresses the importance of face-to-face human interaction so that, at the dawn of the 21st century, business is communication.
The CBD Core, therefore, has to define a typology that promotes human interaction and communication. However, with the understanding that the Beijing CBD will boast over 300 towers, the essential question became one of how the CBD Core could distinguish itself in a forest of towers with isolated cores that minimized interaction. The realization: The same amount of urban substance can be configured in many different ways from a compact tower to a dispersed network. CBD Core evolved to become a lowrise network of dispersed cores and flexible office courtyards combined with commercial and recreational activities that not only maximize interaction, but also offer the opportunity for a CDB with a 24-Hour urban life. As a compliment to this series of dispersed horizontal nodes, a dense network of vertical connections (including offices, apartments, and hotels) is proposed over one of the peripheral urban highways. Beijing’s CBD Core ultimately becomes 100% Park 100% Program.