by Thomas Grillo

It looks like National Development’s decision last year to add condominiums to its Ink Block apartment project at the former Boston Herald site is paying off.

Ted Tye, the Newton company’s managing partner, said 49 condos, or 59 percent of the 83 units, have pre-sold at an average of $1,000 per square foot. The sale price includes a parking space. Buyers are required to submit a 10 percent, non-refundable deposit with an offer to purchase. The condos, dubbed “Sepia at Ink Block,” range from $500,000 for a studio to more than $2 million for a three-bedroom, at the edge of the South End and Chinatown.