By Tenant Advisory Group · Updated
Short answer
Choose a spec suite when speed and low up-front cost matter more than a tailored layout, and when a standard open plan with a few rooms fits how your team works. Choose a custom build-out when you have specific needs for rooms, security or equipment, can wait through design and construction, and are comfortable with the longer term landlords usually want in return for funding it.
What each one is
A spec suite, short for speculative suite, is office space a landlord has designed and built before any tenant signs. The landlord is betting that finished space leases faster than raw space. Spec suites are usually modest in size, laid out with open work areas, a few meeting rooms and a kitchen, and finished in a neutral style. Some come with furniture and cabling.
A custom build-out starts from space that is either unfinished or built for a previous tenant. You work with an architect to design it for your team, and it is constructed after the lease is signed. The landlord typically contributes through a tenant improvement allowance or builds the space to an agreed plan, and you cover anything beyond that contribution.
There is a middle ground worth knowing about: a spec suite that is planned or under construction but not finished. If you commit early enough, a landlord may let you adjust the plan, such as adding a room, changing finishes or relocating the IT closet, without starting from a blank page.
Speed: the main reason spec suites exist
With a finished spec suite, the largest sources of delay in a new office are already behind you. Design is done, permits were issued, and construction is complete. What remains is the lease negotiation, furniture if it is not included, and your own technology setup.
A custom build-out adds several phases between a signed lease and move-in: programming and design, pricing by contractors, landlord approval of the plans, permitting, construction and a final punch list. Each phase depends on the one before it, and several depend on parties outside your control, including the local permitting authority and suppliers of long-lead materials and equipment.
Speed matters most when you have a fixed deadline, such as an expiring lease, an ending sublease or a team that has outgrown coworking. If the date is firm and close, a custom build-out puts it at risk, and you should understand who bears the cost of a delay under the lease before choosing that path.
Control: what you give up in a spec suite
A spec suite is designed for a general tenant, so it reflects the landlord's guess about what most companies want. For a software team that works on laptops and needs a handful of meeting rooms, that guess is often close enough. The gaps appear when your needs are specific.
- Room mix. Spec plans often favor open desks. Teams that spend much of the day on calls, or that need quiet focus rooms for research work, may find too few enclosed spaces.
- Security zoning. If part of your team handles sensitive data or hardware, you may need a separately secured area that a standard plan does not provide.
- Equipment. A spec IT closet is sized and cooled for ordinary network gear. Anything beyond that, such as a lab bench area or a room for development hardware, usually requires changes.
- Brand and client experience. A neutral finish is fine for many teams and a compromise for those who host clients or recruit heavily on site.
- Growth. A spec suite is a fixed size. Ask what adjacent space exists and whether you can secure rights to it.
Changes to a finished spec suite are possible, but they bring back some of the time and approval steps you were trying to avoid, and the landlord may not fund them. Be honest about how many changes you would really need. If the list is long, the spec suite is no longer the faster option.
Cost responsibility: who pays for what
In a spec suite, the landlord has already spent the construction money. You generally do not write a check for build-out, which preserves cash for a growing company. The landlord recovers that investment through the rent, so compare the asking rent and concessions on a spec suite with those on unbuilt space in the same building, not only with other buildings.
In a custom build-out, cost responsibility is negotiated, and the structure matters as much as the amount:
- Allowance. The landlord contributes a fixed amount and you pay any cost above it. You hold the risk of overruns, and you gain control over design and contractor selection.
- Turnkey. The landlord agrees to build an agreed plan at its cost. The landlord holds the overrun risk for that plan, and you pay for changes you request later. The precision of the plan and specifications attached to the lease is what protects you.
- What the allowance covers. Ask whether it can be applied to design fees, cabling, furniture or moving costs, and whether any unused portion can be credited against rent.
- Fees. Ask whether the landlord charges a construction management or supervision fee against the allowance.
A custom build-out also carries costs that sit outside the construction contract, including furniture, audiovisual equipment, security systems and the time your own team spends on decisions. Put those into the comparison too.
Term and credit implications
Landlords recover build-out money over the lease term. The more they spend on space tailored to one tenant, the longer the term they generally want, and the more closely they look at that tenant's credit. For a venture-backed company, a large custom build-out can lead to a larger security deposit or letter of credit request, because the landlord is extending more capital against a balance sheet it views as unproven.
Spec suites are often offered with more flexible term lengths, because the landlord built the space to be reusable by the next tenant. That makes a spec suite a natural fit for a company that wants a direct lease but cannot yet forecast headcount far enough ahead to commit to a long term.
The other side of that trade is the end of the lease. Space built to your design may come with restoration obligations for specialty items. Ask at the time the plans are approved which elements, if any, you would have to remove.
How to choose
Work through these questions in order. The first one that produces a clear answer usually settles it.
- Is there a hard move-in date, and can a custom build-out realistically meet it?
- Does a standard layout support how the team works, or would we need several changes?
- Do we have security, lab or equipment needs that a general-purpose plan cannot meet?
- How long are we willing to commit, and does that term support a landlord-funded custom build-out?
- How much cash and management attention can we devote to a construction project right now?
- Is there room to grow next to the spec suite, or would outgrowing it mean moving again?
- Have we compared the spec suite against unbuilt space on a like-for-like basis, including rent, concessions and our own out-of-pocket costs?
It also helps to tour both types before deciding. Founders often overestimate how custom their needs are until they stand in a well-planned spec suite, and others discover on a tour that the standard plan simply does not hold their team.
When we represent a tenant, Tenant Advisory Group asks landlords to price both paths where a building offers them, so the decision rests on real proposals and not on assumptions about which is cheaper or faster.
Frequently asked questions
Can you negotiate a spec suite lease?
Yes. Rent, free rent, term, deposit, renewal and expansion rights are all negotiable on a spec suite, even though the space itself is already built.
Can a landlord modify a spec suite for us?
Often, especially if the suite is still in design or construction. Changes to a finished suite are possible but add time and approvals, and the landlord may ask you to pay for them.
Is a custom build-out always more expensive for the tenant?
Not necessarily. It depends on the landlord contribution, the design and the term. The reliable way to know is to compare full proposals for both options on the same basis.
What is a turnkey build-out?
An arrangement in which the landlord builds an agreed plan at its own cost and delivers finished space. The plan and specifications attached to the lease define what you will receive, so review them closely.
This guide is general information, not legal, tax or financial advice. Have your attorney review any lease before you sign it.
