All IHG hotels have corporate accounts, there are two different kinds accounts. There are companies that have rates across all IHG systems and a flat discount usually 5-15% from the best flex rates but these are companies like mines that do Major Business with them(60,000 Nights), all other companies have to negotiate directly with them. However you can also negotiate directly with the hotel or IHG can do it for you if you generate enough business. Since IHG has a lot of franchised hotels the hotels negotiate rates and IHG acts as an intermediary

You can call IHG corporate accounts line at 800/635-7001 to find out if your company has a corporate account with them, if they don't have one you can create an account cost free with them. They usually just require that you spend 50 room nights and don't charge anything for it. Once you get an account you will probably have to call the hotel and negotiate a rate with them. If you have an existing account make sure to get the corproate account number for them and plug it in on the web site under more choices like Inexperienced suggested.