You’ll find business premises in the windows of many estate agents, and you can use web search engines such as Rightmove and Zoopla to filter out residential results. The tablet app and website for Rightmove even have handy map features (“Draw a search”) so you can find property in the specific locations you desire.
Word of mouth is a handy way of generating leads – your customers and clients may be aware of upcoming leases, and vacant units. And never underestimate the old fashioned way of laying down some shoe leather. Many office buildings, especially newer ones, will advertise their vacant unit’s right in the windows.