In 2015, LEGO released 3 Architecture sets in the subtheme Landmark Series, all of these sets have been retired. For that year, the total price of all retail sets cost $130, today those sets are valued around $381, a growth of 293%.
Most valuable 2015 LEGO Architecture set
21024 Louvre $145.98
Highest growth 2015 Architecture set
21022 Lincoln Memorial +383.49%
Theme / Subtheme Architecture / Landmark Series
Year 2015
Pieces 274
Availability Retired
21022 LEGO Architecture Lincoln Memorial
Retail $29.99
Value $145.00
Growth  383.5%
Annual growth 9.8%
Theme / Subtheme Architecture / Landmark Series
Year 2015
Pieces 471
Availability Retired
21023 LEGO Architecture Flatiron Building, New York
Retail $39.99
Value $90.21
Growth  125.6%
Annual growth 5.6%
Theme / Subtheme Architecture / Landmark Series
Year 2015
Pieces 695
Availability Retired
21024 LEGO Architecture Louvre
Retail $59.99
Value $145.98
Growth  143.3%
Annual growth 6.5%