Your flat does not vanish from your ownership when the building turns 100. But nothing promises the structure will stand safely that long either. Three separate questions usually get mixed up: how long the building can safely stand, what you actually own, and whether the land is on a lease. Answer them one at a time before buying an old flat.
1. The building's condition comes first
Age is a reason to investigate, not a verdict. Water ingress, corrosion, alterations and maintenance can make two 40-year-old buildings very different risks.
In Mumbai, BMC does not wait for a 100th birthday. Structural audits are enforced under Section 353B of the Mumbai Municipal Corporation Act, and dangerous structures are dealt with under Section 354. Ask for the latest structural audit, repair recommendations, proof the repairs were done and any municipal notices. A report saying repairs were possible is not proof they happened.
2. Your documents answer a different question
The concrete and your legal rights are two separate matters. Start with your registered agreement, the society or condominium documents, any conveyance or lease, and the land records.
In a society building, owning a flat does not give you a separate piece of land you can build on. And demolition of an unsafe building does not, by itself, settle how ownership or occupancy rights are handled — that depends on title, the law, authority orders and any valid redevelopment agreement.
3. A 99-year lease is not a 99-year building
If the land is leased, the lease has its own expiry — counted from when the lease began, not from when you bought your resale flat. Under the Transfer of Property Act, a lease ends when its term expires; renewal depends on the lease terms and the rules, not on residents still living there. Check the lessor, the remaining term, renewal clauses, dues, and whether transfer or redevelopment needs permission.
4. Redevelopment is a process, not a reward
A developer's interest does not guarantee a bigger flat, a payment or a completion date. What your building can deliver depends on its title, the applicable DCPR 2034 provisions, liabilities and funding. Before agreeing to vacate, get the replacement area, rent, payments, security, milestones and remedies in writing — and have an independent lawyer review it.
The practical takeaway
Do not buy an old flat because someone says redevelopment is "certain". Price the flat you are legally buying today, the repairs it needs and the uncertainty you are taking on. Treat any future benefit separately until the documents support it.
Frequently asked questions
Does flat ownership expire after 100 years? There is no universal 100-year expiry. Title and lease terms decide.
Can a much younger building be evacuated? Yes. Safety depends on condition and the authority's assessment, not age alone.
Will redevelopment always give me extra area? No. It depends on feasibility, the scheme and the binding agreements.
Considering an older building in Bandra, Khar, Juhu or Andheri West? Call or WhatsApp Dhaval Seth at Khojmaster Property Consultants — 9321058605. MahaRERA-registered advisory (A51800047853). Zero brokerage on new purchases.
Sources: BMC — Building and Factory RTI manual; Transfer of Property Act, 1882, s.111; BMC — DCPR 2034. This article is for general information and is not legal or structural advice.