I don't think they provide funds directly in the US, but often you can get tax breaks and incentives from federal and state governments. This often applies to annual taxes as well as money used to restore the property.
I've looked at the specifics of some of the tax breaks (roughly: no taxes on the increased value of the property for some number of years), but they mostly seem oriented towards speculators or commercial, rather than residental.
The primary impediment to residential renovation is typically cash on hand to initiate the project.
Which, if true, seems like something like providing a loan facility, borrowed against the future tax credit, maybe with the tax credit packaged for resale on the open market to offset the cost?
Presumably nobody (the homeowner, the neighborhood, the city) wants a house that's falling apart to stay that way.
I know this happens in many places, but it's insane to mandate this, but expect 100% of funding to come from the property owner.
Maintaining a consistent / historical style is a benefit to the community, and so the community should help pay for its own good.