Setting Rent With Vacancy Data, Not the Agent’s Guess

Every time a unit comes up for rent, the leasing agent gives me a number. It is usually within 3,000 yen of the last tenant’s rent, delivered with a confident nod and almost no reasoning behind it. For years I just took it. Then I started logging how long each unit actually sat empty, and a pattern showed up that no agent had ever mentioned: my units in buildings around 10 years old were re-letting in about 28 days on average, and my units in buildings around 30 years old were taking about 61 days. That 33-day gap is worth more than a 3,000 yen rent difference, and once I could see it, I stopped setting rent by feel.

Why the Agent’s Number Is a Guess

The leasing agent gets paid one month’s rent when the unit fills, regardless of whether it took 10 days or 70. Their incentive is a quick fill at a rent that is easy to defend, not the rent that maximizes my income over the year. They also anchor hard to the previous rent and to a handful of active listings, which is a snapshot, not a history. What they almost never do is tell you how many days a unit at that rent will realistically sit empty, because they do not track it the way an owner can.

The Data I Actually Keep

For every turnover across my 9 properties I record six things:

• The asking rent I listed at, and the rent it finally signed at
• The date it went on the market and the date the lease was signed
• Building age at the time of listing
• Unit type and floor
• Season it was listed in
• How many inquiries and viewings it took to get a signature

After about 40 turnovers I had enough to see the shape of it. Days vacant rises with building age, roughly 1.5 to 2 extra days per year of age past the 10-year mark for my unit types. It spikes hard outside the January-to-March moving season, adding 20 to 30 days for anything listed between June and October. And below a certain inquiry count in the first 2 weeks, the unit is almost always mispriced high.

Turning Vacancy Days Into a Rent Number

Here is the actual calculation I run. Say a 30-year-old unit last rented at 66,000 yen. The agent suggests re-listing at 66,000. My data says a 30-year-old unit at market rent sits about 61 days. Sixty-one days of vacancy is roughly 2 months of lost rent, about 132,000 yen, plus the one-month leasing fee, so call it 3 months of rent gone, 198,000 yen, before the new tenant’s first payment.

Now I test a lower number. If I list at 63,000 yen, my history says a unit priced a clear step under the comparable listings fills in about 25 to 30 days instead of 61. That saves roughly 31 days, about 68,000 yen of vacancy. The cost of the 3,000 yen reduction over a 2-year lease is 72,000 yen. So on the first lease term it is close to a wash, and if the tenant renews even once, the lower rent has cost me 3,000 yen a month against a one-time 68,000 yen saving that I keep forever. On a newer building that fills in 28 days anyway, cutting rent to fill faster makes no sense, because there are barely any vacancy days to save.

The Rule I Landed On

Out of all that, a simple decision rule fell out:

• Newer buildings, under about 15 years: list at the top of the comparable range, because vacancy is short and every day of rent counts
• Middle-aged buildings, 15 to 25 years: list at the middle of the range and hold firm for 2 weeks before adjusting
• Older buildings, over 25 years: list slightly below the obvious comparables from day one, because the vacancy days you save are worth more than the rent you give up
• Any building, off-season listing: knock the expected fill time up by 3 to 4 weeks in the math, which usually justifies a 2,000 to 4,000 yen lower asking rent or a month of free rent instead

The 2-Week Checkpoint

I do not guess the fill time perfectly, so I built in a correction. If a listing has not produced at least 3 genuine inquiries in its first 14 days, that is my data telling me the price is wrong, not that the market is slow. I then either drop the asking rent by about 3 percent or add an incentive, usually one month free spread as a rent-back rather than a headline cut, because the headline rent is what sets the renewal and the next tenant’s expectation. On my last 12 turnovers, 4 hit the 2-week checkpoint and got adjusted, and all 4 signed within the following 18 days.

What This Looks Like Over a Year

Before I did this, my portfolio-wide vacancy averaged something like 6 weeks per turnover. After two years of setting rent against the vacancy curve instead of the agent’s number, it is down to about 24 days. On a portfolio my size that is the equivalent of roughly one extra month of total rent collected per year, without raising anyone’s rent and without a single confrontational renewal negotiation. The agents still give me their number. I just treat it as one input now, next to my own history, and when I overrule them I can show exactly why.

An agent’s rent estimate is a starting point, not an answer. The answer is in your own turnover log: how many days does a unit like this, in a building this age, at this time of year, actually sit empty, and what does closing that gap cost against what it saves. That is the approach I use across all 9 of my properties.

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