Entrepreneurs relief query on share & property sale

A person is looking to retire and runs a shop via own Ltd Co.(100% owned and run for many years)

She also personally owns the business premises where the shop is run and over the years the company has paid her a rent.

She is now looking at selling the business and the premises as the buyer wants both.

Q-Can anyone confirm that on above basis ER applies so that gains on both only taxed at 10%

Also if she doesn't sell the premises and instead lets them to the new owner then assume ER would be denied but at what point would any subsequent sale be charge at normal CGT rates?

Thank you for any help