Mere days after being placed on the market, four of eight homes at the now under construction Fifth & Garfield — among the most high-end and expensive homes yet constructed in the emerging Salemtown — are under contract.

Veteran developer and historic preservationist Jim Creason during the past three days had all marketing materials “go live” for the project, according to Grant Hammond of Metropolitan Brokers LLC. Interest has been immediate, he added.

“Three of the four owners are doing interior and roof terrace upgrades,” Hammond said. “We could not be any more pleased with our soft opening.”

Hammond said the team has a projected finish date for the end of first quarter 2013 after having originally anticipating completion in summer 2013.

Located at the northeast corner of Fifth Avenue North and Garfield Street, Fifth and Garfield homes will range in price form $299,000 to $449,000 and in size from 1,610 square feet to 2,300 square feet. The first home is framed.

Creason serves as chief operating officer at Censis Technologies Inc., a health care technology company based in Franklin.