The amount of money you can borrow depends on several aspects. The current value of the property will play a part in the equation.
Another important element would be the ratio of the property value and the size of the loan – this would be the loan-to-value ratio.
Concurrently, the risk associated with the loan will play an important part. Usually, the risk is much lower in the case of residential investment property.
This is why the LTV will usually be higher. In the case of commercial buildings, the risk is higher, so the LTV will be lower. Still, these are just some indicators. Your lender will clarify in more detail all the specifications of your bridging finance.