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 $869, a growth of 397%.
Most valuable 2012 LEGO Architecture set
21016 Sungnyemun $336.55
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 $143.27
Growth  +258.3%
Annual growth 8.9%

21013 Big Ben

Theme / Subtheme Architecture / Landmark Series
Year 2012
Pieces 346
Availability Retired
21013 LEGO Architecture Big Ben
Retail $29.99
Value $127.88
Growth  +326.4%
Annual growth 11.3%

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 $261.07
Growth  +273.0%
Annual growth 7.5%

21016 Sungnyemun

Theme / Subtheme Architecture / Landmark Series
Year 2012
Pieces 325
Availability Retired
21016 LEGO Architecture Sungnyemun
Retail $34.99
Value $336.55
Growth  +861.8%
Annual growth 15.0%