[Home](./index.md) > [bitburner](./bitburner.md) > [OfficeAPI](./bitburner.officeapi.md) > [upgradeOfficeSize](./bitburner.officeapi.upgradeofficesize.md) ## OfficeAPI.upgradeOfficeSize() method Upgrade office size. **Signature:** ```typescript upgradeOfficeSize(divisionName: string, city: CityName, size: number): void; ``` ## Parameters

Parameter	Type	Description
divisionName	string	Name of the division
city	[CityName](./bitburner.cityname.md)	Name of the city
size	number	Amount of positions to open

**Returns:** void ## Remarks RAM cost: 20 GB