Patrons walk through the National Gallery of Art. (AP)

Tuesday’s news that an ambitious renovation will transform the East Building of the National Gallery of Art came with lots of numbers. Here’s what the East Gallery looks like now, and here is what it’s expected to look like after construction is complete.

1978 Opening of the East Building, designed by famed architect I.M. Pei, shepherding the Gallery into the modern museum era.

3 years of renovations expected, beginning in Jan. of 2014.

12,260 square feet of new exhibition space will be added.

10-foot ceilings display drawings, prints and photos ground level currently in the East Building.

35-foot high Tower Galleries currently accommodate larger installations.

2 new Tower Galleries, hexagonal in shape, will be carved out of the lay-light areas between the ceiling of the upper level galleries used for exhibitions and the skylights above them, and they will reach 23-feet-high.

$30 million in private donations for the renovation came from three gifts from prominent area philanthropists; National Gallery President Victoria Sant and her husband, Roger; board member Mitchell Rales and his wife, Emily: and David Rebenstein, co-chief executive of the Carlyle Group, the D.C.-based private-equity firm.

National Gallery of Art (Getty Images)

2,965 square-feet of added public space in the northwest pod Tower Gallery at the corner of Fourth Street and Pennsylvania.

3,190 square-feet of added space in northeast pod near Third Street.

4.2 million people visited the National Gallery of Art last year.

929,646 visited the East Building.

READ MORE: National Gallery of Art announces $30 million renovation to East Building