The verdict in three sentences
For a New York landlord managing 30 office buildings, a custom tenant portal costs, as a 2026 order of magnitude, 150,000 to 400,000 USD, plus an integration with the property management system (Yardi, MRI) of 30,000 to 80,000 USD. Compared with SaaS platforms billed around 0.15 to 0.50 USD per square foot per year, custom development pays off once the portfolio passes roughly 1.5 million sq ft or when operating expense recovery rules are unusual. What decides success is the quality of the operating expense data you expose to tenants, far more than the interface.
What a commercial tenant portal must cover in 2026
Office tenants in Manhattan, often corporate real estate teams, expect three things: understanding their operating expense escalations and annual reconciliation, logging a work order and tracking its resolution, and booking shared amenities (conference rooms, event space, rooftop, concierge). With NYC Local Law 97 emissions caps now in force, sharing energy data has also become part of the landlord-tenant relationship.
| Module | Key function | Development cost (2026 order of magnitude) |
|---|---|---|
| Documents and charges | Escalation bills, CAM reconciliation, budgets, lease abstracts | 25,000 - 60,000 USD |
| Work orders | Requests with photos, priority, vendor SLAs | 20,000 - 50,000 USD |
| Amenity booking | Per-building calendar, quotas, access badges | 18,000 - 45,000 USD |
| News and building life | Works, outages, events, satisfaction surveys | 8,000 - 20,000 USD |
| ESG reporting | Energy use, Local Law 97, green lease data | 25,000 - 70,000 USD |
| Access management and SSO | Multi-company accounts, roles, Microsoft Entra ID | 12,000 - 30,000 USD |
| Mobile app (PWA) | Notifications, on-site work orders | 20,000 - 60,000 USD |
The ESG module matters more each year: Local Law 97 fines reach 268 USD per metric ton of CO2 above the cap, and landlords need tenant submetering data to stay compliant. A portal that shares this data removes dozens of spreadsheet exchanges per year.
Custom or SaaS: the five-year math
Specialized commercial real estate SaaS usually bills per square foot managed. Custom development requires a heavier initial investment but a stable recurring cost. Here is a comparison for a 1.6 million sq ft portfolio.
| Item (5 years) | Specialized SaaS | Custom portal |
|---|---|---|
| Onboarding | 20,000 - 60,000 USD | 150,000 - 400,000 USD |
| Property management system integration | Often included for partner vendors | 30,000 - 80,000 USD |
| Subscription or annual support | 240,000 - 800,000 USD per year | 36,000 - 96,000 USD per year |
| Hosting and security | Included | 6,000 - 15,000 USD per year |
| Custom expense recovery rules | Configuration only | Full |
| Data and code ownership | Vendor | Landlord |
| 5-year total (estimate) | 1,220,000 - 4,060,000 USD | 390,000 - 1,035,000 USD |
At 1.6 million sq ft, the gap is wide. For a smaller portfolio of 200,000 sq ft, SaaS at 0.15 USD per sq ft costs 30,000 USD per year and remains competitive. The break-even point usually sits between 600,000 and 1.5 million sq ft, depending on negotiated pricing.
The PMS integration, the most underestimated line
Lease, charge and billing data lives in the property management system. Without reliable sync, the portal shows wrong amounts and loses tenant trust within weeks.
| Integration point | Difficulty | Recommended sync frequency |
|---|---|---|
| Buildings, units, leases | Medium | Daily |
| Escalation bills and invoices | Medium | At each billing run |
| Annual reconciliation | High (allocation rules) | Yearly with review |
| Building engineering work orders | High (vendor tool) | Real time via API |
| Energy consumption | Medium (BMS, meters) | Monthly |
Plan 8 to 12 weeks for a robust integration, with acceptance testing on two pilot buildings before rolling out the other 28.
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Mini case study
Michael, head of asset management at a commercial landlord in New York, oversees 30 buildings totaling 1.5 million sq ft and 240 tenants. His property management team handles about 4,000 requests per year by email and phone, at 20 minutes each, or 1,330 hours. A portal with work orders and a charges area absorbs around 50% of these requests: 665 hours saved, or about 53,000 USD per year at 80 USD per loaded hour. The chosen project costs 260,000 USD plus 55,000 USD of integration and 70,000 USD per year of support and hosting. The competing SaaS, negotiated at 0.20 USD per sq ft, would have cost 300,000 USD per year. Over five years, custom comes to about 665,000 USD versus 1,500,000 USD, before counting tenant retention gains.
FAQ
How long does it take to deliver a tenant portal?
Plan 5 to 7 months for a first version with charges, work orders and amenity booking. The PMS integration often accounts for 8 to 12 weeks of that timeline.
What security standards apply?
Tenants will ask for SOC 2 style controls, SSO and audit logs. Budget 10,000 to 25,000 USD for a penetration test and security review before go-live.
Can we start with a single building?
That is the recommended path: a 6 to 8 week pilot on 2 buildings validates the charges data. A pilot budget usually represents 30 to 40% of the total cost.
What maintenance budget should we plan?
Support of 3,000 to 8,000 USD per month covers fixes, minor changes and security updates. New modules, such as ESG reporting, are budgeted separately.
Do tenants actually use these portals?
Adoption depends mostly on how useful the charges data is: a realistic target is 60 to 75% of tenants active in year one if reconciliations are published there.
Let's scope your project. We define the priority modules, the integration with your property management system and an indicative budget per phase, with a pilot deliverable in 8 to 10 weeks. Detailed quote within 48 h. WhatsApp +221 77 596 93 33.
Mohamed Bah
Fondateur, Kolonell
Passionate about digital and entrepreneurship in Africa, Mohamed has been helping Sénégalese businesses with their digital transformation since 2020. Founder of Kolonell, he believes every SME deserves a professional and accessible online présence.
