Sales rose to $3.22 billion in 2014 compared to $2.17 billion last year, according to a report.
The buildings on Trantor Place sold to a private investor.
The median sales price for Upper Manhattan townhouses was $1.2 million in 2013, a report says.
Investors spent $1.28 billion on Bronx real estate last year — a 63 percent jump over 2011.
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