In the face of the current humanitarian crisis, questions about the built heritage may go into the background. The lack of mobility, the loss of tourism and an atmosphere of despair, put the discussion of urban heritage in an undervalued scenario. However, after the crisis, a resurgence of policies for the protection and safeguarding of heritage is expected from the enhancement of the cultural, community and perspectives of cultural memory.
I think that depends on the context of each country. But heritage education is one of the main keys. But as Fabian Andres said, now we will have time to stop everything. And a slow restart ...
It starts to repertory all the built heritage, classify it according to local and international standards.
Decide what you want to do with it according to the goals you want to achieve with this built heritage.
Among the goals: cultural, collective memory, investment, rehabilitation, revitalization, cultural tourism and so on
Decide what to restore and what to re-built and what to leave it as it.
Think of a people engagement in these processes depending on local policies
I think one of the best approach to sustainable conservation of built heritage is to link all the above goals with cultural tourism to bring the appropriate funding when there is a lack of public funding of heritage projects with people engagement and the right investments. It has been proven when the investment on heritage is right the R.O.I. is high (Examples of Fes and Istanbul).
I think that one of the ways that can be used in the conservation of the built heritage is to move away a little from the traditional conceptions of a historical monument, without completely detaching itself from the Unesco convention for the protection of the world cultural and natural heritage of 1972. Before the danger of disappearance symbolic significance can be recovered, with new use values from different layers of significance such as restoration, exhibition, tourism or transformation
as said by Maria every heritage is unique and depend on traditional techniques used, but awareness is important. the documentation for record of existing values to the heritages.
I repeat my answer to previous dialogue, sorry for who's reading it again.
If you intend "social sustainability" I have an example I am very (emotionally) close to:
http://www.ogrtorino.it/en/locations/ogr-cult
This important space in Turin (Italy) is not just a beautiful example of how a crucial industrial space of a city (symbol of national industrialism itself) has been converted to a creative social space that showcases from art to science of any kind; the administration took a step further in adapting the space for supplying extremely needed healthcare features in this awful COVID19 emergency.
Please check it out:
(the website and the beautiful timelapse of temporary hospital building)
I see natural and cultural heritage as a continuum, and sustainability efforts in the protection of it, as a spectrum, not as antagonists. One of the aspects to really look deeply into, amongst the relevant ones in this moment of crisis, is tourism. And it's relevant now, now that people are - in certain countries - getting out of their houses and starting to crowd places again. I think that as heritage experts we should inspire citizens to enjoy their doorsteps more (community - locality), in order to contain big pilgrimages to the orthodox tourism destinations. Heritage is all around us and too much of it is considered "b grade" (too young, not enough meaningful, etc) and falls into the gap of protection. I stumbled on an interesting article: "tourism by invitation only"! (And I will add "and at your doorstep").