When they searched his home, police found and confiscated a computer and documents that the suspect used to launch the website.
Tien said when he realised the company already had two official websites under two separate domain names, hapulicocomplex,com,vn and hapulicocomplex.vn, he had the idea to launch a website with a similar address.
At the beginning, he simply wanted to re-post information about real estate and stocks from the company's websites in order to gain profit.
The company, which is the key investor in a trade centre, offices and a building complex in Thanh Xuan District's Nguyen Huy Tuong Street, reported the unofficial website to authorities after realising that the information could affect its reputation and business.
Police officer An said that this was the first case of its kind reported in the city.
Investigators said the suspect's alleged crime was to "illegally post and use information on the internet" (Article 226, Criminal Law) and to "calumniate" (Article 122).
An said the case was a warning for firms and businesses when thinking about their web domains.