When touring potential commercial spaces in Miami, you’ve likely come across terms like “gray shell” or “white box.” In industry speak, these are terms used to describe just how “ready” a space is for occupancy. Some commercial spaces need more construction before they are tenant ready. Others are closer to completion and nearly ready for the tenant to move in.

Whether you’re a landlord preparing to lease a property or a tenant planning a custom build-out, understanding the difference between a gray and white box can save you time, money and stress as you plan your next move.

What is a Gray Shell?

A gray shell is essentially a blank slate. It’s a completely unfinished commercial space, typically delivered with:

• Bare concrete floors and exposed ceilings
• Unfinished walls or open studs
• No plumbing fixtures or electrical wiring
• An HVAC system that may be installed but lacks controls or ductwork
• A basic sprinkler system (required by code) that isn’t yet dropped to ceiling height

In other words, a gray shell gives tenants full control over how their space is designed, but it also means a longer construction timeline and a higher upfront investment to get it move-in ready.

What is a White Box?

A white box (also known as a vanilla shell or warm shell) is a step closer to finished. These spaces typically include:

• Drywalled and primed walls ready for paint
• A finished ceiling with lighting in place
• Completed electrical and HVAC systems with controls and ductwork
• Plumbing and restroom facilities
• Sprinkler systems extended to the finished ceiling height

In short, a white box space allows tenants to focus on the final design and branding touches (e.g., fixtures, finishes and furniture) without the heavy construction work that comes with starting from scratch.

Gray Box vs. White Box: Choosing the Right Approach

Traditionally, many landlords preferred to lease gray shell spaces so tenants could customize their layouts from the ground up. However, post-COVID leasing trends have shifted.

Today’s tenants, especially in the retail, restaurant and office sectors, tend to be more risk-averse and budget-conscious. They’re looking for turnkey spaces that can be occupied quickly with minimal disruption or capital investment.

For property owners, that means converting a gray shell to a white box can make a listing more attractive and reduce vacancy time. On the other hand, for highly specialized tenants, a gray shell may still make sense as it allows for more flexibility in layout and systems.

Unsure What’s Right for You? Contact Us at Seacoast Consulting Group

Whether you’re a landlord deciding how to prepare your property or a tenant evaluating potential spaces, the right starting point depends on your goals, budget and timeline. If you’re evaluating your options, we can help.

At Seacoast Consulting Group, we help clients navigate these early decisions with clarity. Our team provides detailed assessments, cost comparisons and timeline projections so you know exactly what to expect before you begin. Contact us today to schedule a free consultation.