In 2013, LEGO released 5 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 $450, today those sets are valued around $1,875, a growth of 317%.
Most valuable 2013 LEGO Architecture set
21021 Marina Bay Sands $980.43
Largest 2013 LEGO Architecture set
21050 Architecture Studio 1,210 pieces
Most owned 2013 Architecture set
21015 The Leaning Tower of Pisa
5 sets

21015 The Leaning Tower of Pisa

Theme / Subtheme Architecture / Landmark Series
Year 2013
Pieces 345
Availability Retired
21015 LEGO Architecture The Leaning Tower of Pisa
Retail $34.99
Value $154.48
Growth  +341.5%
Annual growth 8.6%

21017 Imperial Hotel

Theme / Subtheme Architecture / Architect Series
Year 2013
Pieces 1,188
Availability Retired
21017 LEGO Architecture Architect Series Imperial Hotel
Retail $129.99
Value $200.00
Growth  +53.9%
Annual growth 4.6%

21018 United Nations Headquarters

Theme / Subtheme Architecture / Landmark Series
Year 2013
Pieces 597
Availability Retired
21018 LEGO Architecture United Nations Headquarters
Retail $49.99
Value $160.37
Growth  +220.8%
Annual growth 8.6%

21021 Marina Bay Sands

Theme / Subtheme Architecture / Landmark Series
Year 2013
Pieces 602
Availability Retired
21021 LEGO Architecture Marina Bay Sands
Retail $74.99
Value $980.43
Growth  +1207.4%
Annual growth 10.2%

21050 Architecture Studio

Theme Architecture
Year 2013
Pieces 1,210
Availability Retired
21050 LEGO Architecture Studio
Retail $159.99
Value $379.92
Growth  +137.5%
Annual growth 6.1%