The parking lot in front of Royal Oak's Public Library closed this week and preliminary construction began Wednesday to build a seven-story parking deck there as part of city's $58 million Civic Center project.The deck is being built on a former surface parking next the lot in front of City Hall, where work began last month to build a six-story office building being constructed by private developer Ron Boji of Central Park Development Group,Construction costs for the new deck are about $15.