Keystone Buy to Let Mortgages has launched two product ranges aimed at landlords borrowing to higher LTVs or looking to arrange larger loans.
Its new Classic product range offers loans up to 80% LTV, while its Premier range caters for larger loans.
Keystone, a joint venture between broker Mortgages for Business and lender Aldermore, was re-launched onto the buy-to-let market in April 2012.
It has subsequently arranged £100 million of gross lending in just 20 months.
Its Classic range offers both fixed and discounted tracker rates up to 80% LTV for loans between £50,000 and £400,000.
It also has rates up to 75% LTV for loans of up to £600,000. The range is available on standard buy-to-lets, multi-units and HMO properties.
Keystone's new Premier range caters for landlords looking to borrow between £600,000 and £1 million. Deals are available to 70% LTV on standard buy-to-lets and multi-unit properties.
Managing director David Whitaker said: "The increase in LTV and loan amounts has been made in direct response to feedback from landlords in London and the South East where property prices are, on average, considerably higher than elsewhere in the UK."
The range will also help landlords and other affluent areas where prices are rising. "We've had numerous enquiries for larger loans from brokers north of the border, with clients looking to invest in some of the major Scottish cities."
The existing Keystone rates, which are slightly cheaper, will be withdrawn from 21 February.
Rob Lankey, managing director of commercial mortgages at Aldermore, which funds the Keystone products, said:
"The cost of three and five-year funds has been rising in recent months and the new ranges allow us to adjust our pricing accordingly.
"We appreciate that brokers often spend a lot of time putting together deals that stack up before submitting applications, so this overlap will give them time to finish the cases they are currently working on without having to redo the figures."
Comments