Another option to invest in a rental property as a business is to consider a commercial mortgage. This type of loan usually requires a decent deposit, and you will need to show that there is plenty of rental demand to make the investment viable.
In some cases, you might need to provide guarantees or other security.
Commercial mortgages can be used to purchase complete apartment blocks, although a mortgage of this size would usually require a specialist lender.
Interest rates are usually higher than for a residential apartment mortgage and will be tailored to your application rather than fitting in with a standard rates table.