I have a property managemnt company in Santa Clarita and we just leased out a house on a 3 year lease which was handicap accessible and also had an elevator in the house (two storey).
Let me know what your specific requirements are and I'll try and help you find a suitable property.
United America Realty
Please contact me by email. I will check with a disabled friend of mine and ask him what his successes have been when looking for rental properties. I assume you are looking for wheelchair accessible with ramps, rails in the bathrooms, etc?
I can't make any promises but I will at least try to get info for you!