Commercial solicitors are simply solicitors who deal with commercial areas of law.
Commercial solicitors will usually be found providng legal advice to businesses of all sizes. Although, commercial solicitros may speciliase in a particular area of law, they can assist with matterssuch as; mergers and acquisitions, property, insurance employment, finance, intellectual proeprty and copetition law.
If you are buting a property for business purposes or dealing with leases etc, then you would need to instruct commercial solicitors who specialise in property law and conveyancing.
However, as with all aspects of business, their advice and assistance does not come cheap.