The barn owl (Tyto alba) is found throughout the state of Florida and inhabits hardwood and tropical hammocks, urban areas with abundant palms and large hardwoods, and manmade structures such as silos, barns, and deserted buildings. Barn owls forage voraciously for rodents in open areas such as prairies, pastures, fields, and sparsely wooded areas.
Barn owls in Florida breed from March through July and nest in secluded places like caves, barns, tree cavities, and large bird houses. They build no actual nest and lay from 3-11 (most commonly 5-7) white or buff-white eggs.
Many people attract barn owls by erecting nest boxes in an effort to control local rodent populations (see CNN story and Tom Hoffman's article).
International Barn Owl Restoration Project
Another Barn Owl page with info on how to build nest boxes
A general owl page with lots of links