In 2009, LEGO released 4 Architecture sets across 2 subthemes, all of these sets have been retired. Subthemes for that year included Architect Series and Landmark Series. For that year, the total price of all retail sets cost $180, today those sets are valued around $776, a growth of 331%.
Most valuable 2009 LEGO Architecture set
21005 Fallingwater $450.00
Highest growth 2009 Architecture set
21003 Seattle Space Needle +548.92%
4 sets

21002 Empire State Building

Theme / Subtheme Architecture / Landmark Series
Year 2009
Pieces 77
Availability Retired
21002 LEGO Architecture Empire State Building
Retail $19.99
Value $57.50
Growth  +187.6%
Annual growth 5.6%

21003 Seattle Space Needle

Theme / Subtheme Architecture / Landmark Series
Year 2009
Pieces 57
Availability Retired
21003 LEGO Architecture Seattle Space Needle
Retail $19.99
Value $129.72
Growth  +548.9%
Annual growth 19.6%

21004 Solomon Guggenheim Museum

Theme / Subtheme Architecture / Architect Series
Year 2009
Pieces 208
Availability Retired
21004 LEGO Architecture Architect Series Solomon Guggenheim Museum
Retail $39.99
Value $139.02
Growth  +247.6%
Annual growth 10.5%

21005 Fallingwater

Theme / Subtheme Architecture / Architect Series
Year 2009
Pieces 811
Availability Retired
21005 LEGO Architecture Architect Series Fallingwater
Retail $99.99
Value $450.00
Growth  +350.0%
Annual growth 6.7%