For many types of multi-tenant office buildings, especially buildings that share common areas and HVAC systems, it can be more common to have the landlord contract for both utilities and janitorial expenses, and then include those expenses as part of the lease rate or through the operating expenses or NNN.
For renters, this generally means rental payments and basic utilities such as electric, water, and heating. Collectively, these expenses should total no more than 30% of a renter's gross monthly income. Gross income is what someone earns before taxes and other deductions are taken out.
Ask the landlord what companies they're contracted with for utilities, ie do they use the city or a private company, what internet companies have lines to the building, ect. The easiest and cheapest thing to do is to ask them what's already hooked up and just use that.
Base rent is characterized by its invariability and predictability, providing security for both landlords and tenants. It does not include incidental expenses, like utilities or maintenance, which are often the tenant's responsibility.