Its product range, which offers finance to 75% loan-to-value, includes a 2.79% fix until November 2017 and a 2.85% discount rate to January 2018.
Liz Syms, managing director at Connect Mortgage Club, said: “We are delighted to be able to offer our network members access to these excellent new products.
“This new offering from Marsden Building Society demonstrates their fresh commitment to the buy-to-let market.
“The low interest rate combined with the favourable rental calculation makes these products extremely competitive, especially for portfolio clients.
“We have been working hard to strengthen our already comprehensive panel of specialist lenders to ensure our ARs have access to the very best deals in today’s market and I am confident these deals will prove to be extremely popular.”
Products come with free valuations and legal benefits.
Heather Crinion, general manager, operations, at Marsden Building Society, added: “We are excited by the opportunity to work alongside Connect Mortgage Club.
“Our new BTL portfolio which is now available to Connect’s ARs boasts competitive products, straight-forward criteria and is supported by our award winning mortgage team.
“Plus our approach to personal underwriting will ensure they receive the highest level of service possible.”