Real estate investment trusts that focus on investing in residential MBS continued to see declines in their portfolios during the second quarter, but their earnings outlook may have improved somewhat this week, analysts say. Residential mortgage REITs held a combined $327.3 billion of single-family MBS as of the end of the second quarter, according to a new market analysis by Inside MBS & ABS. That was down 5.4 percent from the previous quarter, and it was the third straight quarterly decline since REIT MBS holdings reached a high of $374.2 billion in September 2012. REIT MBS holdings are...[Includes one data chart]