An ambitious, $280 million expansion of Connecticut Children’s in Hartford that would roughly double the size of the hospital could be connected to a new parking garage across Washington Street via a pedestrian skywalk. The plans for a parking garage, near the southwest corner of Washington and Lincoln streets, were included in a master plan for the 25-year-old campus filed with the city’s planning and zoning commission. If all approvals are secured, construction could start this spring and take two years to complete. Financing is expected to be though a combination of debt and foundation fundraising. Construction on the hospital and the parking garage would be timed so they would open at the same time, Calhoun said. The Frog Hollow NRZ wrote that it supported the new tower, but it was reserving judgment on the parking garage until it learned more details.