Thanks for your questions.
Almost all medium size high street practices will have a commercial property department who deal with grant of lease like yours. Each solicitor in those departments will specialize in this field. You can use the following Law Society website search engine to find a list of firms near you. You can then check the firm's page to see the size. Select your postcode and "commercial properly" as the area of law from the drop down menu:-
If you let me know your local area I will see if I can recommend a specific firm.
You should be looking at paying between £700-1,000.00 for them to act on your behalf and I would try and pin them down on a fixed fee. You will also require commercial searches of the local authority, water and drainage supplier together with an environmental search the total cost of which will be around £350 and a land registry fee of £50.00 to have the lease noted against the freehold title as a notice (if the landlord agrees). As the the term of the lease is less than 7 years it will not generate it's own separate land registry title.
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