Its 5-year fixed product at 75% LTV stands at 4.34% and is available to both employed and self-employed non-professional landlords.
A selection of 60% and 75% LTV fixed products have also been reduced by 0.30%.
These include a 2-year fix at 60% LTV, reduced to 2.69%, a 2-year fix at 75% LTV reduced to 3.19% and a 2-year tracker at 75% LTV reduced to 3.05%.
Brad Fordham, managing director of Santander for Intermediaries, said: “These latest changes, which include the launch of our 5-year fixed for those landlords seeking guaranteed payments for the longer term plus reduced 60% and 75% LTV rates, demonstrate our commitment to this sector.
“We will continue to review our Buy to Let offering, to ensure our competitive mortgages offer good value and are accessible to both employed and self-employed non-professional landlords, meeting their requirements for both now and in the future.”
The products come with homebuyer and remortgage cashback solutions and command a £1,495 fee.
