I'd be glad to. In the U.S., the tax incentive is for 20% of qualified rehabilitation expenses. Oftentimes there's a state credit. I think in 37 of the 50 states there are state credits, which generally provide another 10%, maybe 15%, against state tax liabilities as well. Often these credits can also be twinned with a low-income housing credit, a solar credit, or other kinds of credit to bring more capital to a project in an area where there's a difference between the cost of renovating the building and what a conventional banker would be willing to put into that project.
On October 3rd, 2017. See this statement in context.