diff --git a/graphics/tiles.rc b/graphics/tiles.rc
index 83bb0d6..c2d4a33 100644
--- a/graphics/tiles.rc
+++ b/graphics/tiles.rc
@@ -711,7 +711,7 @@
 695   seaport@32,0           (conducts)
 696   seaport@48,0           (conducts)
 697   seaport@0,16           (conducts)
-698   seaport@16,16    (zone)(conducts)
+698   seaport@16,16    (zone)(conducts)(building=4x4)
 699   seaport@32,16          (conducts)
 700   seaport@48,16          (conducts)
 701   seaport@0,32           (conducts)
@@ -730,7 +730,7 @@
 713   airport@64,0           (conducts)
 714   airport@80,0           (conducts)
 715   airport@0,16           (conducts)
-716   airport@16,16    (zone)(conducts)
+716   airport@16,16    (zone)(conducts)(building=6x6)
 717   airport@32,16          (conducts)
 718   airport@48,16          (conducts)
 719   airport@64,16          (conducts)
@@ -765,7 +765,7 @@
 747   coal@32,0              (conducts)   (onpower=916)
 748   coal@48,0              (conducts)   (onpower=920)
 749   coal@0,16              (conducts)                                                
-750   coal@16,16       (zone)(conducts)                                        
+750   coal@16,16       (zone)(conducts)(building=4x4)
 751   coal@32,16             (conducts)   (onpower=924)
 752   coal@48,16             (conducts)   (onpower=928)
 753   coal@0,32              (conducts)
@@ -781,7 +781,7 @@
 762   firestation@16,0        (conducts)
 763   firestation@32,0        (conducts)
 764   firestation@0,16        (conducts)
-765   firestation@16,16 (zone)(conducts)
+765   firestation@16,16 (zone)(conducts)(building=3x3)
 766   firestation@32,16       (conducts)
 767   firestation@0,32        (conducts)
 768   firestation@16,32       (conducts)
@@ -791,7 +791,7 @@
 771   police@16,0            (conducts)
 772   police@32,0            (conducts)
 773   police@0,16            (conducts)
-774   police@16,16     (zone)(conducts)
+774   police@16,16     (zone)(conducts)(building=3x3)
 775   police@32,16           (conducts)
 776   police@0,32            (conducts)
 777   police@16,32           (conducts)
@@ -802,7 +802,7 @@
 781   stadium@32,0           (conducts)
 782   stadium@48,0           (conducts)
 783   stadium@0,16           (conducts)
-784   stadium@16,16    (zone)(conducts)
+784   stadium@16,16    (zone)(conducts)(building=4x4)
 785   stadium@32,16          (conducts)
 786   stadium@48,16          (conducts)
 787   stadium@0,32           (conducts)
@@ -819,7 +819,7 @@
 797   stadium2@32,0          (conducts)
 798   stadium2@48,0          (conducts)
 799   stadium2@0,16          (conducts)
-800   stadium2@16,16   (zone)(conducts)
+800   stadium2@16,16   (zone)(conducts)(building=4x4)
 801   stadium2@32,16         (conducts)
 802   stadium2@48,16         (conducts)
 803   stadium2@0,32          (conducts)
@@ -836,7 +836,7 @@
 813   nuclear@32,0           (conducts)
 814   nuclear@48,0           (conducts)
 815   nuclear@0,16           (conducts)
-816   nuclear@16,16    (zone)(conducts)
+816   nuclear@16,16    (zone)(conducts)(building=4x4)
 817   nuclear@32,16          (conducts)
 818   nuclear@48,16          (conducts)
 819   nuclear@0,32           (conducts)