Downtown Shreveport will be then center of attention tomorrow when the Louisiana Trust for Historic Preservation meets here.  The meeting will be held at the Robinson Film Center and will give LTHP members a chance to see first-hand a successful re-use of a historic building.  They'll also hear about some of the other preservation efforts going on downtown.  Then, after lunch at Monsour's, they'll hop aboard a trolley for a guided tour of downtown and some of the projects they heard about earlier in the day.