Related Clues:

• N.Y.C. sights beginning in the 1870's
• '... or ___!'
• Woods rival
• Pipe types
• Old measures of length
• Urban trains, for short
• 90-degree angles
• Lean-tos
• Building wings
• Level ends?
• See 52-Across
• The six of ''Little Nellie Kelly''
• Wren's wings?
• Hollow center?
• Corner pieces