How do percent for art laws apply to private development?

Increasingly, percent for art legislation and local ordinances are written to encourage or mandate that private development (above a certain monetary threshold) participate in percent for art laws.  The requirements of participation vary from location to location, with some programs mandating the creation of new artworks, some offering incentives in return for participation (like greater floor-area-ratios or increased building height limits), and others accepting an alternative contribution to a general fund used and administered by the local public art program.  In most cases, percent for art laws include some combination of these factors and are tailored to the needs of the community.