The verdict in three sentences
For a landlord managing 3 shopping centers and 240 commercial leases, whether in New York or Paris, the choice is between packaged lease management software at 20,000 to 60,000 EUR a year (22,000 to 66,000 USD) and custom software at 60,000 to 140,000 EUR (66,000 to 154,000 USD). Custom makes sense when leases include percentage rent tied to tenant sales, unusual indexation clauses (CPI escalations in the US, ILC index in France) and per-center expense reconciliations that packaged tools handle poorly. Plan on a 6-month project and a break-even around year three.
The features that matter in a shopping center
A mall is not managed like an office building. Each tenant has its own lease, a guaranteed base rent, sometimes percentage rent of 6 to 10% of sales, a share of common area maintenance (CAM), rebillable works and a marketing fund contribution. Regulations (the Pinel law in France, lease audit clauses in New York) also require a precise breakdown of charges and an annual statement. All of this must be automated for 240 leases.
| Feature | What the software automates | Estimated 2026 gain |
|---|---|---|
| Rent indexation | Annual or triennial calculation, caps, escalation clauses | 2 days per month of manager time |
| Percentage rent | Monthly tenant sales collection, overage rent calculation | 0.5 to 1% of rent recovered |
| CAM reconciliations | Budget, true-up, pro-rata shares per center | Turnaround cut from 9 to 4 months |
| Lease calendar | Renewals, notices, options, alerts | Zero missed deadlines |
| Billing and collections | Rent invoices, direct debits, graduated reminders | 90-day arrears down 30% |
| Investor reporting | Occupancy, occupancy cost ratio, WALT, yield | Monthly committee pack in 1 click |
| Tenant portal | Sales reporting, documents, work orders | 40% fewer emails |
The occupancy cost ratio (rent and charges divided by tenant sales) is the first metric mall managers look at. It is only reliable when sales reporting is built into the software.
Packaged or custom: the numbers
| Option | Upfront investment | Annual cost | 5-year cost (estimate) | Fits when |
|---|---|---|---|---|
| Entry-level package | 10,000 EUR setup | 20,000 EUR | 110,000 EUR | Simple leases, little percentage rent |
| Premium package | 30,000 EUR | 45,000 to 60,000 EUR | 255,000 to 330,000 EUR | Large portfolio, dedicated team |
| Standard custom | 60,000 to 90,000 EUR | 10,000 to 15,000 EUR | 110,000 to 165,000 EUR | 3 to 5 centers, specific clauses |
| Advanced custom | 100,000 to 140,000 EUR | 15,000 to 22,000 EUR | 175,000 to 250,000 EUR | Tenant portal, BI, accounting connector |
| Spreadsheet and general ledger | 0 EUR | 1 FTE property manager | 300,000 EUR of payroll | Avoid beyond 50 leases |
Over 5 years, standard custom software often costs less than a premium package, and the landlord owns the tool. Packages keep the edge on included regulatory updates and fast rollout. In New York, add roughly 10% for USD conversion and local integration (Yardi or MRI exports are common).
The 6-month project plan
| Phase | Duration | Content |
|---|---|---|
| Scoping | 4 weeks | Audit of 20 typical leases, clause mapping, mockups |
| Core | 6 weeks | Units and leases registry, indexation, billing |
| Charges | 5 weeks | Budgets, allocation keys, reconciliations |
| Sales and portal | 5 weeks | Tenant sales reporting, percentage rent, tenant portal |
| Migration and testing | 4 weeks | Migration of 240 leases, parallel run over one quarter |
Data migration is the most underestimated item: budget 10 to 15% of the project to clean up indexation history.
Mini case study
Claire, CEO of a retail property company, manages 3 centers and 240 leases generating 18 million EUR (about 19.8 million USD) of annual rent. Her current package costs 52,000 EUR a year and does not compute percentage rent, which two managers handle in Excel.
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- Advanced custom project: 120,000 EUR, then 18,000 EUR a year.
- License savings: 52,000 minus 18,000, i.e. 34,000 EUR a year.
- Better percentage rent recovery: 0.5% of 18 million EUR, i.e. 90,000 EUR a year (conservative estimate).
- Total annual gain: about 124,000 EUR, a payback in just over 11 months.
These amounts are a 2026 order of magnitude, to be validated through the lease audit.
FAQ
Does the software handle CPI, ILC and other indices?
Yes, it pulls published indices (US CPI, French ILC, ILAT or ICC for older leases) and applies cap clauses. Computing 240 indexations takes minutes instead of 2 days.
Can it connect to our accounting system?
Yes, a connector to Sage, Cegid, Yardi exports or an ERP typically costs 8,000 to 15,000 EUR. Billing and payment entries sync daily.
How do tenants report their sales?
Through a secure portal or by automatic import from their POS when possible. An automatic reminder on the 5th of each month pushes the reporting rate above 95%.
Do the charge reconciliations meet regulatory requirements?
The software produces the charge inventory, the annual statement and the multi-year budget. It separates non-rebillable items such as major structural works.
What if we acquire a fourth center?
The tool is multi-site by design: adding a center means importing its units and leases, 2 to 3 weeks of work, with no license surcharge.
Let's scope your project. Share the number of centers, leases and your percentage rent clauses, and we will price a scope between 60,000 and 140,000 EUR delivered in 6 months. 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.
