diff --git a/mod-list.html b/mod-list.html
index e4121d69..f5b2b470 100644
--- a/mod-list.html
+++ b/mod-list.html
@@ -249,6 +249,7 @@
 <tr><td>all_around_fillers.js</td><td>Adds directional Filler variants</td><td>idk73248</td></tr>
 <tr><td>allliquids.js</td><td>Made all elements liquids</td><td>Adora</td></tr>
 <tr><td>amogus.js</td><td>Adds a small amogus structure</td><td>Alice</td></tr>
+<tr><td>citybuilding.js</td><td>Adds seeds that create miniature buildings and other city-related items</td><td>SquareScreamYT</td></tr>
 <tr><td>collab_mod.js</td><td>Created by multiple people, adds random things</td><td>mrapple, ilikepizza, stefanblox</td></tr>
 <tr><td>elem3.js</td><td>Adds all elements and combinations from Elemental 3 [Very Large]</td><td>Sophie</td></tr>
 <tr><td>funny elements 2022-11-15.js</td><td>Adds a few curated randomly-generated elements</td><td>Alice</td></tr>
diff --git a/mods/citybuilding.js b/mods/citybuilding.js
new file mode 100644
index 00000000..e99a655a
--- /dev/null
+++ b/mods/citybuilding.js
@@ -0,0 +1,216 @@
+function building_1_segment() {
+    if (pixel.foundation = true && pixel.height < pixel.limit) {
+        if (isEmpty(pixel.x+1,pixel.y-pixel.height) &&
+        isEmpty(pixel.x-1,pixel.y-pixel.height) &&
+        isEmpty(pixel.x+2,pixel.y-pixel.height) &&
+        isEmpty(pixel.x-2,pixel.y-pixel.height) &&
+        isEmpty(pixel.x+2,pixel.y-1-pixel.height) &&
+        isEmpty(pixel.x-2,pixel.y-1-pixel.height) &&
+        isEmpty(pixel.x+1,pixel.y-1-pixel.height) &&
+        isEmpty(pixel.x-1,pixel.y-1-pixel.height) &&
+        isEmpty(pixel.x,pixel.y-1-pixel.height) &&
+        isEmpty(pixel.x,pixel.y-pixel.height)) {
+            createPixel("glass",pixel.x+1,pixel.y-pixel.height);
+            createPixel("glass",pixel.x-1,pixel.y-pixel.height);
+            createPixel("concrete",pixel.x+2,pixel.y-pixel.height);
+            createPixel("concrete",pixel.x-2,pixel.y-pixel.height);
+            createPixel("concrete",pixel.x+1,pixel.y-1-pixel.height);
+            createPixel("concrete",pixel.x-1,pixel.y-1-pixel.height);
+            createPixel("concrete",pixel.x+2,pixel.y-1-pixel.height);
+            createPixel("concrete",pixel.x-2,pixel.y-1-pixel.height);
+            createPixel("concrete",pixel.x,pixel.y-1-pixel.height);
+            createPixel("concrete",pixel.x,pixel.y-pixel.height);
+            pixel.height = pixel.height+2
+        }
+    }
+}
+function filldirt2x5() {
+    var dirtPixelElem = pixelMap[pixel.x][pixel.y+1];
+    if (!isEmpty(pixel.x,pixel.y+1) && !outOfBounds(pixel.x,pixel.y+1)) {
+            dirtPixelElem = pixelMap[pixel.x][pixel.y+1].element
+        }
+    if (isEmpty(pixel.x+1,pixel.y+1)) {
+        createPixel(dirtPixelElem,pixel.x+1,pixel.y+1);
+    }
+    if (isEmpty(pixel.x-1,pixel.y+1)) {
+        createPixel(dirtPixelElem,pixel.x-1,pixel.y+1);
+    }
+    if (isEmpty(pixel.x+2,pixel.y+1)) {
+        createPixel(dirtPixelElem,pixel.x+2,pixel.y+1);
+    }
+    if (isEmpty(pixel.x-2,pixel.y+1)) {
+        createPixel(dirtPixelElem,pixel.x-2,pixel.y+1);
+    }
+    if (isEmpty(pixel.x+2,pixel.y+2)) {
+        createPixel(dirtPixelElem,pixel.x+2,pixel.y+2);
+    }
+    if (isEmpty(pixel.x-2,pixel.y+2)) {
+        createPixel(dirtPixelElem,pixel.x-2,pixel.y+2);
+    }
+}
+elements.building_1 = {
+    color: "#a78d38",
+    tick: function(pixel) {
+        if (!isEmpty(pixel.x,pixel.y+1)) {
+            if (isEmpty(pixel.x+1,pixel.y) &&
+            isEmpty(pixel.x-1,pixel.y) &&
+            isEmpty(pixel.x+2,pixel.y) &&
+            isEmpty(pixel.x-2,pixel.y) &&
+            isEmpty(pixel.x+2,pixel.y-1) &&
+            isEmpty(pixel.x-2,pixel.y-1) &&
+            isEmpty(pixel.x+1,pixel.y-1) &&
+            isEmpty(pixel.x-1,pixel.y-1) &&
+            isEmpty(pixel.x,pixel.y-1) &&
+            isEmpty(pixel.x+2,pixel.y-2) &&
+            isEmpty(pixel.x-2,pixel.y-2) &&
+            isEmpty(pixel.x+1,pixel.y-2) &&
+            isEmpty(pixel.x-1,pixel.y-2) &&
+            isEmpty(pixel.x,pixel.y-2)) {
+                filldirt2x5();
+                movePixel(pixel,pixel.x,pixel.y-1);
+                createPixel("concrete",pixel.x+1,pixel.y+1);
+                createPixel("concrete",pixel.x-1,pixel.y+1);
+                createPixel("concrete",pixel.x+2,pixel.y+1);
+                createPixel("concrete",pixel.x-2,pixel.y+1);
+                createPixel("wood",pixel.x,pixel.y+1);
+                pixel.limit = 10 + Math.floor(Math.random() * 5)*2;
+                createPixel("concrete",pixel.x+1,pixel.y);
+                createPixel("concrete",pixel.x-1,pixel.y);
+                createPixel("concrete",pixel.x+2,pixel.y);
+                createPixel("concrete",pixel.x-2,pixel.y);
+                createPixel("concrete",pixel.x+1,pixel.y-1);
+                createPixel("concrete",pixel.x-1,pixel.y-1);
+                createPixel("concrete",pixel.x+2,pixel.y-1);
+                createPixel("concrete",pixel.x-2,pixel.y-1);
+                createPixel("concrete",pixel.x,pixel.y-1);
+                pixel.foundation = true;
+                pixel.height = pixel.height+2
+            }
+        }
+        if (pixel.foundation == true && pixel.height < pixel.limit) {
+            building_1_segment();
+        }
+        else if (pixel.foundation == true && pixel.height >= pixel.limit) {
+            pixel.built = true;
+        }
+        if (pixel.built == true) {
+            changePixel(pixel,"wood");
+        }
+        doDefaults(pixel);
+    },
+    properties: {
+        height:0,
+        limit:0,
+        foundation:false,
+        built:false
+    },
+    category: "citybuilding",
+    state: "solid",
+    density: 1500,
+    cooldown: defaultCooldown,
+    seed: true,
+    maxSize: 1,
+    excludeRandom: true,
+    behavior: behaviors.STURDYPOWDER,
+};
+elements.building_1_tall = {
+    color: "#d9c243",
+    tick: function(pixel) {
+        if (!isEmpty(pixel.x,pixel.y+1)) {
+            if (isEmpty(pixel.x+1,pixel.y) &&
+            isEmpty(pixel.x-1,pixel.y) &&
+            isEmpty(pixel.x+2,pixel.y) &&
+            isEmpty(pixel.x-2,pixel.y) &&
+            isEmpty(pixel.x+2,pixel.y-1) &&
+            isEmpty(pixel.x-2,pixel.y-1) &&
+            isEmpty(pixel.x+1,pixel.y-1) &&
+            isEmpty(pixel.x-1,pixel.y-1) &&
+            isEmpty(pixel.x,pixel.y-1) &&
+            isEmpty(pixel.x+2,pixel.y-2) &&
+            isEmpty(pixel.x-2,pixel.y-2) &&
+            isEmpty(pixel.x+1,pixel.y-2) &&
+            isEmpty(pixel.x-1,pixel.y-2) &&
+            isEmpty(pixel.x,pixel.y-2)) {
+                filldirt2x5();
+                movePixel(pixel,pixel.x,pixel.y-1);
+                createPixel("concrete",pixel.x+1,pixel.y+1);
+                createPixel("concrete",pixel.x-1,pixel.y+1);
+                createPixel("concrete",pixel.x+2,pixel.y+1);
+                createPixel("concrete",pixel.x-2,pixel.y+1);
+                createPixel("wood",pixel.x,pixel.y+1);
+                pixel.limit = 15 + Math.floor(Math.random() * 10)*2;
+                createPixel("concrete",pixel.x+1,pixel.y);
+                createPixel("concrete",pixel.x-1,pixel.y);
+                createPixel("concrete",pixel.x+2,pixel.y);
+                createPixel("concrete",pixel.x-2,pixel.y);
+                createPixel("concrete",pixel.x+1,pixel.y-1);
+                createPixel("concrete",pixel.x-1,pixel.y-1);
+                createPixel("concrete",pixel.x+2,pixel.y-1);
+                createPixel("concrete",pixel.x-2,pixel.y-1);
+                createPixel("concrete",pixel.x,pixel.y-1);
+                pixel.foundation = true;
+                pixel.height = pixel.height+2
+            }
+        }
+        if (pixel.foundation == true && pixel.height < pixel.limit) {
+            building_1_segment();
+        }
+        else if (pixel.foundation == true && pixel.height >= pixel.limit) {
+            pixel.built = true;
+        }
+        if (pixel.built == true) {
+            changePixel(pixel,"wood");
+        }
+        doDefaults(pixel);
+    },
+    properties: {
+        height:0,
+        limit:0,
+        foundation:false,
+        built:false
+    },
+    category: "citybuilding",
+    state: "solid",
+    density: 1500,
+    cooldown: defaultCooldown,
+    seed: true,
+    maxSize: 1,
+    excludeRandom: true,
+    behavior: behaviors.STURDYPOWDER,
+};
+elements.small_tree_1 = {
+    color: "#4bd943",
+    tick: function(pixel) {
+        if (!isEmpty(pixel.x,pixel.y+1)) {
+            if (isEmpty(pixel.x+1,pixel.y-1) &&
+            isEmpty(pixel.x-1,pixel.y-1) &&
+            isEmpty(pixel.x,pixel.y-1) &&
+            isEmpty(pixel.x+1,pixel.y-2) &&
+            isEmpty(pixel.x-1,pixel.y-2) &&
+            isEmpty(pixel.x,pixel.y-2) &&
+            isEmpty(pixel.x+1,pixel.y-3) &&
+            isEmpty(pixel.x-1,pixel.y-3) &&
+            isEmpty(pixel.x,pixel.y-3)) {
+                createPixel("wood",pixel.x,pixel.y-1);
+                createPixel("wood",pixel.x,pixel.y-2);
+                createPixel("plant",pixel.x,pixel.y-3);
+                createPixel("plant",pixel.x-1,pixel.y-1);
+                createPixel("plant",pixel.x-1,pixel.y-2);
+                createPixel("plant",pixel.x-1,pixel.y-3);
+                createPixel("plant",pixel.x+1,pixel.y-1);
+                createPixel("plant",pixel.x+1,pixel.y-2);
+                createPixel("plant",pixel.x+1,pixel.y-3);
+                changePixel(pixel,"wood");
+            }
+        }
+        doDefaults(pixel);
+    },
+    category: "citybuilding",
+    state: "solid",
+    density: 1500,
+    cooldown: defaultCooldown,
+    seed: true,
+    maxSize: 1,
+    excludeRandom: true,
+    behavior: behaviors.STURDYPOWDER,
+};