They are keeping faith with the sector on the grounds that their properties "cannot steal away in the night", according to the Association of Residential Letting Agents.
A second quarter survey by Arla found that nearly two thirds of all landlords expect to buy investment properties in the next 12 months.
With the average buy-to-let investment lasting 16.2 years, nine out of ten landlords would not sell even if house prices were to fall, the survey discovered.
"We believe that investor landlords do their research and know and understand the investment market in residential property to rent," said Arla chief executive Adrian Turner.
"They also feel secure in the knowledge that their investment cannot steal away in the night."
The fact that landlords are untroubled by reports claim-ing the buy-to-let market has peaked and is on its way down is underlined, Arla says, by statistics showing that a high proportion of its members have been active in the market since 2000 and have an aver-age portfolio of five properties.
Nearly half say they have invested to create a nest egg while 43 per cent look for rental yield as well as capital appreciation.
Only six per cent have invested solely for income while a "negligible" 2.7 per cent look for a short term capital gain.
Tenants stay for an average of 17 months, regardless of the length of the rental agreement.
Arla's figures show that in the Midlands, the annual rate of return over five years on cash purchase basis is 11.39 per cent and 23.14 per cent on a geared investment.