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 $732, a growth of 307%.
Most valuable 2009 LEGO Architecture set
21005 Fallingwater $398.60
Highest growth 2009 Architecture set
21003 Seattle Space Needle +560.18%
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 $62.36
Growth  +212.0%
Annual growth 7.1%

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 $131.97
Growth  +560.2%
Annual growth 8.1%

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 $138.69
Growth  +246.8%
Annual growth 10.4%

21005 Fallingwater

Theme / Subtheme Architecture / Architect Series
Year 2009
Pieces 811
Availability Retired
21005 LEGO Architecture Architect Series Fallingwater
Retail $99.99
Value $398.60
Growth  +298.6%
Annual growth 7.1%