Hey Gregory,
There are two kinds of mortgage, one as a non resident which you can borrow approx 70% and as a resident 90% +. Of course they will also want evidence of income. On fincas they do a valuation so if the finca needs renovating they will only lend on the actual today worth of the building, no extras for improvements. A friend of mine who has a successful business down here met this problem. Anything over 20 years old they class as old. I have just brought a finca, but the location is good, as I have sea and valley views and not far from Marbella, so it should hold its value. If you buy in some hick town away from anywhere you may have a problem. When you are borrowing don?t forget to add the 10-12% taxes onto the price also, some people forget. Also make sure of electricity, water, phone, as in some areas people have been waiting 3 years for a phone...... This applies on the Costa Del Sol. In Valencia you have to watch about land grabbing, i.e. they can take your land from you for developments etc, I hear their are more problems in that area. So be careful.
The banks will do their own surveys of the property, but make sure you have a good lawyer also, as I have heard sometimes the property title isn?t always transferred to the new owner which can cause major probs. So a good lawyer is essential.
Before buying, spend some time in the area to see if you really like it do your homework and be careful who you trust, especially other English or foreigners. Learn Spanish as soon as you can, if you are living in the country the natives won?t speak English, and you will feel isolated otherwise and less independent. Another tip is to find out when you buy who the current owners use for plumbers and other tradespeople, as the person will have knowledge of the property.
Good luck