Irish Nationwide gets mixed bond exchange results

* Average 90 pct take-up for 500 mln pounds bonds swap

* 33.5 pct take-up for 900 mln euro senior note

* New notes will be govt-guaranteed

LONDON, Aug 10 (Reuters) - Troubled mortgage lender Irish Nationwide Building Society reported a mixed response to its $2.1 billion bond exchange offer on Monday, with the strongest take-up seen for its sterling-denominated bond.

The mutually owned lender saw an average 90 percent participation rate on its offer to swap two sterling-denominated bonds totalling 500 million pounds ($833 million) into new government-guaranteed debt.

The take-up on the 900 million euro ($1.28 billion) senior floating rate note, due 2012, was weaker at around 33.5 percent, or 301.9 million euros.

All new notes will be government-guaranteed and will consist of 239.5 million euro floating rate notes, 153.3 million sterling notes, 19.1 million euro fixed rate notes and 126.1 million pounds of Lower Tier 2 notes.

The offer had set a price of 78 percent of face value for 900 million euro senior floating-rate notes and for 250 million pounds of sterling senior bonds and at 55 percent for 250 million pounds of Lower Tier 2 subordinated bonds [ID:nLU588553].

The new bonds will be consolidated with existing government-guaranteed debt. Irish Nationwide said previously that all of the new senior bonds would be priced to pay a spread of 170 basis points.

The building society said last month it aimed to strengthen the quality of its capital while providing bondholders the opportunity to obtain bonds that mature earlier and have the advantage of a government guarantee. ($1=.7048 EURO) ($1=.6000 POUND) (Reporting by Natalie Harrison; editing by Gilbert Kreijger)