The buy-to-let product is available at up to 70% loan to value with an £899 arrangement fee.
Andy Young, chief executive of TBMC, said: “We are delighted to launch this fantastic new buy-0to-let mortgage with Darlington. The product is highly competitive in the 70% LTV bracket offering one of the lowest initial rates available at 3.74%.
“In the current marketplace, products normally have either, a low initial rate and high fee or vice versa.
“This latest TBMC exclusive offers the best of both worlds with a low initial rate and a low flat fee of just £899.”
Young added that this was a great product especially for amateur landlords.
Darlington only accepts a maximum of three properties.
Young added: “We are expecting the product to be popular with intermediaries and their landlord clients but there is a limited tranche of funds available via TBMC only.
“Those who are interested should be quick off the mark.”
David Copland, marketing and sales controller at Darlington, said: “The buy-to-let mortgage market is continuing to show signs of growth and Darlington is looking to increase its levels of buy-to-let business in 2012.
“We have selected TBMC to distribute this excellent new product to control the volume and suitability of new applications.
“TBMC is a well respected buy-to-let mortgage distributor with highly experienced processing staff who can help us to achieve our goals in this sector.”