Calgary's office market is still one of the best performers in the country, however a new report says the city will need a strong performance to absorb all the new supply set to come online.

In a report from CBRE, Calgary and Toronto were singled out as the best office markets in the country. Due to a heightened level of activity, the report did identify the possibility of an overabundance of supply.

A report detailing Calgary's bustling downtown office market is suggesting a potential over-abundance of space could result in increased vacancy.

With as much as 7.5 million sq. ft. of space set to come to the downtown core over the next four to five years, a report from Cresa calls the potential impact of the current level of development "significant", adding to the possibility of increased vacancy in the area.

Calgary's commercial market continues to rise to new heights with second quarter investment in the sector totaling nearly $1 billion.

According to a report from RealNet Canada Inc., investment in the sector climbed by 28 per cent in the second quarter of 2013 for a total of $925.52 million.

Space in Calgary's once constricted downtown office market could soon be a little easier to come by.

While ranked as the tightest market in Canada in a report from Avison Young, the vacancy rate in the downtown core could escalate alongside new developments set to enter the market.