It was a year of healthy appetites when it came to expanding apartment portfolios in 2011. Sellers took advantage of this by trading properties across some of the most attractive apartment markets at a feverish pace. More than 3,500 multifamily assets changed hands last year and $53.9 billion was placed on the deals, according to a recent RCA report. Amidst all that volume, industry leaders emerged from the pack. According to our survey respondents, these were 10 of the top multifamily sellers of 2011. For the full top 50, stay tuned for MFE’s May issue.