[HooverDam]

^Obviously Im not sure what your group is proposing as far as 'temporary infill' is concerned but I for one would be thrilled with green space. Citrus groves, park space, community gardens, desert gardens, etc would all be high on my list. Stuff that will cool the neighborhood, beautify it, have a use, but also be easily replaceable when it comes time to build the medical facilities.

EDIT: VV I know it probably would make the skin crawl of the generally left leaning downtown population but Id be all for corporate sponsorships/ads if it helped made something like this possible. Though in this economy Im not sure how much corporations would be willing to spend. But if we fill an empty lot with an orange grove and its the "Fresh & Easy Citrus Grove" or whatever Id be A-ok w/ that.