Proof of accomodation for Spanish "Non-lucrative Residence Visa"

Is it possible to get a Spanish "Non-lucrative / Retirement Residence Visa" without providing a copy of a lease contract or property deed as proof of accommodation?
The application instructions state:
If you have a property in Spain you need to provide the title deed of property. In case of leasing or renting contract you must provide the contract together with the copy of the landlord’s ID and copy of title deed of property or property certificate.
My wife and I are planning to travel in Europe for 5 months, thus the need for the visa, but we are just staying in various AirBnB's the whole time.
What do you do if you're just staying in an AirBnB? Are you just out-of-luck?
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What documents do I need for a non lucrative visa?
Required documents to get the non-lucrative visa- Copy of the Passport.
- Copy of the birth certificate.
- Medical certificate.
- Health insurance contracted with a private Spanish company.
- Proof of funds (minimum \u20ac26.000 per applicant)
- Criminal Records.
What is proof of residency in Spain?
A Spanish residency certificate confirms your status as a resident in Spain. For stays of up to 3 months there is no need to register or obtain any Spanish documentation unless you are going to be working, or for example buying a property, in which case you'll need an NIE.What documents do I need to apply for Spanish residency?
However, usually, this consists of:How do I get a non lucrative residence visa for Spain?
The main requirements for the non-Lucrative visa are as follows:Non Lucrative Residence Visa Valencia Spain 4K
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