Complex sentence: His first large project, measuring 100,000 square feet, was 547-553 W.27th/548-552 W.28th, located just east of 11th Avenue spanning the block between 27th and 28th street.
Split into simpler sentences: His first large project, measuring 100,000 square feet, was 547-553 W.27th/548-552 W.28th. It is located just east of 11th Avenue spanning the block between 27th and 28th street.