The Society has also expanded its buy-to-let range with new expat, holiday let and credit assist products.
Related topic: Mortgages
The latest round of rate cuts marks the tenth reduction in four months.
51% of remortgaging landlords have reported that they would take a five-year fixed rate.
Rates are reducing by up to 39bps.
The average product fee stands above £1,000.
The transaction increases LendInvest's total Funds under Management to £4.2 billion.
Fleet says landlord borrowers are looking at flexible, shorter-term products.
The Society will now accept between 50% and 100% of benefits income received.
Rates have reduced across the lender's F1 and F2 product ranges.
Rates have reduced by up to 0.15%.