Soeman Hs Library is one of Pekanbaru's more distinctive modern buildings, with a roof form often read as an open book or a rehal, the stand used for reading the Quran. It is a public library, archive, meeting place, and small cultural stop rather than a conventional attraction.
The best reason to visit is the combination of architecture and Riau reading culture. Look for the Malay collections, then use the upper levels and glassy spaces to get a different view of the city.