After a lengthy discussion last week, a Zoning Board of Appeals hearing on an apartment complex proposed off Prospect Street was continued to July 9. Chairwoman Lois Barbour said she hopes the board will complete its review of conditions and close the hearing on the Simon Hill development at the next session. She said about 40 residents attended last week’s meeting. “It is unusual for public hearings to maintain such a high level of continuing interest — especially so late in the process,” she said. Neighbors have raised concerns about height, density, and proximity to abutting homes. The 126-unit development is proposed under the state’s Chapter 40B affordable-housing law, and 25 percent of the units on the 17.5-acre parcel of land would be rented out at affordable rates.