Evan,
Almost entirely; one house will be all stock Philos for hybridizing, one for stock Alocasias for hybridizing, one for Anthuriums, one for Caladiums, one for miscellaneous and one for seedlings - I guess I'll need one to grow some plants up to size for selection, and plenty of outdoor growing areas for hardier plants and/or cold resistance tests. Already I have enough big Philos to fill up one of the 20 x 40 greenhouses, and can come close to filling up the other 20 x 40 with Alocasias, many of which need repotting and will be reaching for the GH roof. Anthuriums and Caladiums are easier to contain. My largest current greenhouse (10 x 20) will become either the new Caladium house or miscellaneous house.
Space, as they say, IS the final frontier . . . especially for plant people.