About 15 seniors every day have been coming into the leasing office at Park Lane at Sea View, a new rental complex for seniors on Staten Island, Crain’s New York Business reported. The complex has 52 market-rate apartments, 40 of which are still available. At Park Lane, half of the units are for seniors who earn below 60 percent of the household median, and the other half are for those earning less than 180 percent of the median, which is $55,039. Staten Island’s elderly population is projected to increase 26.9 percent between 2010 and 2020, according to a recent study by the New York City Planning Department, creating a need for additional senior housing.