The National Asset Management Agency says it has taken over loans originally valued at £3.35 billion (€4 billion) in Northern Ireland.
NAMA's head of credit and risk Ronnie Hanna told a conference on housing in Belfast that Northern Ireland loans represented 5% of the agency's total portfolio.
Investment properties account for £1 billion (€1.2 billion) of this, while property and land under development takes up £350m (€400m).
Of the total £3.35 billion Northern Ireland portfolio, 60% represents land that is not under development, 29% represents commercial investments, 10% land under development and 1% residential development. Just under a third of NAMA's Northern Ireland loans are in Belfast.
Mr Hanna said NAMA had a neutral view on all property markets - including Northern Ireland - and had no interest in hoarding assets longer than necessary.
'We will work with debtors if it makes commercial sense, but debtors must submit a business plan which includes a realistic repayment schedule and we require full co-operation and full disclosure from debtors,' he added.