diff --git a/markdown/bitburner.officeapi.getofficesizeupgradecost.md b/markdown/bitburner.officeapi.getofficesizeupgradecost.md
new file mode 100644
index 000000000..1488a0d85
--- /dev/null
+++ b/markdown/bitburner.officeapi.getofficesizeupgradecost.md
@@ -0,0 +1,28 @@
+<!-- Do not edit this file. It is automatically generated by API Documenter. -->
+
+[Home](./index.md) &gt; [bitburner](./bitburner.md) &gt; [OfficeAPI](./bitburner.officeapi.md) &gt; [getOfficeSizeUpgradeCost](./bitburner.officeapi.getofficesizeupgradecost.md)
+
+## OfficeAPI.getOfficeSizeUpgradeCost() method
+
+Cost to Upgrade office size.
+
+<b>Signature:</b>
+
+```typescript
+getOfficeSizeUpgradeCost(divisionName: string, cityName: string, asize: number): number;
+```
+
+## Parameters
+
+|  Parameter | Type | Description |
+|  --- | --- | --- |
+|  divisionName | string | Name of the division |
+|  cityName | string | Name of the city |
+|  asize | number |  |
+
+<b>Returns:</b>
+
+number
+
+Cost of upgrading the office
+
diff --git a/markdown/bitburner.officeapi.md b/markdown/bitburner.officeapi.md
index ad66b2683..a3fcca6d9 100644
--- a/markdown/bitburner.officeapi.md
+++ b/markdown/bitburner.officeapi.md
@@ -26,6 +26,7 @@ Requires the Office API upgrade from your corporation.
 |  [getHireAdVertCost(divisionName)](./bitburner.officeapi.gethireadvertcost.md) | Get the cost to Hire AdVert |
 |  [getHireAdVertCount(adivisionName)](./bitburner.officeapi.gethireadvertcount.md) | Get the number of times you have Hired AdVert |
 |  [getOffice(divisionName, cityName)](./bitburner.officeapi.getoffice.md) | Get data about an office |
+|  [getOfficeSizeUpgradeCost(divisionName, cityName, asize)](./bitburner.officeapi.getofficesizeupgradecost.md) | Cost to Upgrade office size. |
 |  [getResearchCost(divisionName, researchName)](./bitburner.officeapi.getresearchcost.md) | Get the cost to unlock research |
 |  [hasResearched(divisionName, researchName)](./bitburner.officeapi.hasresearched.md) | Gets if you have unlocked a research |
 |  [hireAdVert(divisionName)](./bitburner.officeapi.hireadvert.md) | Hire AdVert. |
diff --git a/src/NetscriptFunctions/Corporation.ts b/src/NetscriptFunctions/Corporation.ts
index 52fe44a43..05845801c 100644
--- a/src/NetscriptFunctions/Corporation.ts
+++ b/src/NetscriptFunctions/Corporation.ts
@@ -543,6 +543,21 @@ export function NetscriptCorporation(
         return Promise.resolve(office.setEmployeeToJob(job, amount));
       });
     },
+    getOfficeSizeUpgradeCost: function (adivisionName: any, acityName: any, asize: any): number {
+      checkAccess("getOfficeSizeUpgradeCost", 8);
+      const divisionName = helper.string("getOfficeSizeUpgradeCost", "divisionName", adivisionName);
+      const cityName = helper.string("getOfficeSizeUpgradeCost", "cityName", acityName);
+      const size = helper.number("getOfficeSizeUpgradeCost", "size", asize);
+      if (size < 0) throw new Error("Invalid value for size field! Must be numeric and grater than 0");
+      const office = getOffice(divisionName, cityName);
+      const initialPriceMult = Math.round(office.size / CorporationConstants.OfficeInitialSize);
+      const costMultiplier = 1.09;
+      let mult = 0;
+      for (let i = 0; i < size / CorporationConstants.OfficeInitialSize; ++i) {
+        mult += Math.pow(costMultiplier, initialPriceMult + i);
+      }
+      return CorporationConstants.OfficeInitialCost * mult;
+    },
     assignJob: function (adivisionName: any, acityName: any, aemployeeName: any, ajob: any): Promise<void> {
       checkAccess("assignJob", 8);
       const divisionName = helper.string("assignJob", "divisionName", adivisionName);
diff --git a/src/ScriptEditor/NetscriptDefinitions.d.ts b/src/ScriptEditor/NetscriptDefinitions.d.ts
index 040e6d82f..d99fa5558 100644
--- a/src/ScriptEditor/NetscriptDefinitions.d.ts
+++ b/src/ScriptEditor/NetscriptDefinitions.d.ts
@@ -6175,6 +6175,14 @@ export interface OfficeAPI {
    * @returns A promise that is fulfilled when the assignment is complete.
    */
   setAutoJobAssignment(divisionName: string, cityName: string, job: string, amount: number): Promise<boolean>;
+  /**
+   * Cost to Upgrade office size.
+   * @param divisionName - Name of the division
+   * @param cityName - Name of the city
+   * @param size - Amount of positions to open
+   * @returns Cost of upgrading the office
+   */
+  getOfficeSizeUpgradeCost(divisionName: string, cityName: string, asize: number): number;
 }
 
 /**