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A Qatari investment firm has completed the second of two purchases of downtown Boston office assets in recent days.

Alduwaliya Asset Management bought 101 Summer St. for $37.4 million on Oct. 4, according to documents filed at the Suffolk Registry of Deeds.

The 5-story, 48,905-square-foot office building was built in 1899, according to city records. The property is assessed at $13.8 million.

The purchase was the second part of a two-building sale by Nuveen Real Estate to Alduwaliya. The other property in the transaction was 99 Chauncy St., which sold for $70.35 million.

The portfolio is 100 percent leased to 19 tenants with a weighted average remaining lease term of 7.23 years, according to CBRE, whose Capital Markets team represented Nuveen in the transaction. The team’s Timothy Mulhall described the marketing process as “extremely competitive.”