DOWNTOWN BROOKLYN—Brooklyn’s tallest tower, the rental-condo hybrid at388 Bridge Street, is now 50-percent sold with closings and move-ins underway. The Stahl Organization-developed building’s 144 condos returned in a StreetEasy search are priced between $572,200 and $5,999,000, with condos reportedly fetching upwards of $1,600-per-square-foot.