Your landlord is going to lose a deal in this market over $10 - $15,000 that (although may legally be his) was never really his?? That's smart.
Couple of points:
1. I would remind the landlord that the economy is in the toilet, and retailers doing deals are few and far between.
2. Most retailers knowing they have leverage over the landlords in today's market are making strong demands for TI money and/free rent. Since this space is basically a turnkey operation, the landlord won't need to spend any money on any tenant improvement allowance. You didn't mention how big the salon is, so let's say it's 1,800 sf - it's not uncommon for a LL to pay $10/sf on TI, or $18,000 for this space. The way he should look at it in this market is, since the prior tenant left everything, he just saved me $18,000.
In today's market, the landlord may offer 60 - 90 days free rent, and depending on the tenant, even longer periods of free rent. The free rent is usually given to allow the tenant the time to build out the space. But today, it's also just used as an incentive to attract tenants. As the space is ready to go, he can minimize the free rent he may or may not need to offer.
4. Lastly, by giving the tenant a turnkey operation and not having to fork out additional cash, the LL will make it easier for the tenant to succeed.
Hope that helps!