The rate changes affected variable rate products for loans of more than £100,000, with the lowest rate now 5.19 per cent.
The biggest cut applied to the semi-commercial offering at 65 per cent loan to value LTV.
The lender’s commercial investment range covers loans of £50,000 to £25m, up to 75 per cent LTV.
The products can be used for complex commercial investments like serviced offices and property multi-lets on licences.
“The commercial investment sector has faced great change and uncertainty over recent months. We remain fully committed to helping brokers maximise the abundance of opportunity that exists,” said Gavin Seaholme, head of sales at Shawbrook Bank.