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 $704, a growth of 291%.
Most valuable 2009 LEGO Architecture set
21005 Fallingwater $372.20
Highest growth 2009 Architecture set
21003 Seattle Space Needle +544.42%
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 $63.25
Growth  +216.4%
Annual growth 7.0%

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 $128.82
Growth  +544.4%
Annual growth 8.3%

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 $140.00
Growth  +250.1%
Annual growth 10.3%

21005 Fallingwater

Theme / Subtheme Architecture / Architect Series
Year 2009
Pieces 811
Availability Retired
21005 LEGO Architecture Architect Series Fallingwater
Retail $99.99
Value $372.20
Growth  +272.2%
Annual growth 7.3%