The U.S. office market had its smallest increase in net occupancies in a year in the second quarter as job growth slowed, Reis Inc. said.

Net occupancies climbed by 4.14 million square feet (384,000 square meters) in the second quarter, the least since 2.73 million square feet was added a year earlier, according to the New York-based property-research firm. The gain in occupancies, the sixth in a row, compared with 6 million square feet in the first quarter.

Effective rents, or what tenants pay after landlord incentives such as a free month are included, rose to $22.72 per square foot from $22.66 in the first quarter and $22.27 a year earlier, Reis said. The national office vacancy rate of 17.2 percent was unchanged from the first quarter and down from 17.5 percent a year earlier.