In 2012, 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 $175, today those sets are valued around $884, a growth of 405%.
Most valuable 2012 LEGO Architecture set
21016 Sungnyemun $365.67
Largest 2012 LEGO Architecture set
21014 Villa Savoye 660 pieces
Most owned 2012 Architecture set
21013 Big Ben
4 sets

21012 Sydney Opera House

Theme / Subtheme Architecture / Architect Series
Year 2012
Pieces 270
Availability Retired
21012 LEGO Architecture Architect Series Sydney Opera House
Retail $39.99
Value $133.06
Growth  +232.7%
Annual growth 9.0%

21013 Big Ben

Theme / Subtheme Architecture / Landmark Series
Year 2012
Pieces 346
Availability Retired
21013 LEGO Architecture Big Ben
Retail $29.99
Value $123.81
Growth  +312.8%
Annual growth 11.0%

21014 Villa Savoye

Theme / Subtheme Architecture / Architect Series
Year 2012
Pieces 660
Availability Retired
21014 LEGO Architecture Architect Series Villa Savoye
Retail $69.99
Value $261.83
Growth  +274.1%
Annual growth 7.1%

21016 Sungnyemun

Theme / Subtheme Architecture / Landmark Series
Year 2012
Pieces 325
Availability Retired
21016 LEGO Architecture Sungnyemun
Retail $34.99
Value $365.67
Growth  +945.1%
Annual growth 13.2%