I am the owner of a number of domains. The best names are:
propertyrome.com, propertydubai.com, propertybarcelona.com,
propertymadrid.com. Do you thing I could make money out of these
domains by selling them or perhaps develop them. I would highly
appreciate some great suggestions. If possible some estimates of money
I can make.

I believe the best way to make money with these domains is to create
pages that offer them for sale.  Developers will find you.  We did
this with Costa Rican property sites, and it lead to the sale of
several domains, including http://www.costapalmera.com and
http://www.Mtpalmera.com

I wonder if pessimistic answers are rated well.  I can't see how you
can make considerable money on domain names unless you get lucky and a
stubborn entrepreneur is willing to pay more than $7 a year, instead
of coming up with something original like property-dubai.com.


AC

It really depends on the domain name.  While the domain name with a
hyphen might be "original", it is not as valuable as the name without.
 Same goes for numbers and it even matters as to how many letters in
the name. The shorter the name, the easier to remember, as long as the
name makes sense (not just a jumble of letters thrown together).  You
must also take into account how "generic" the domain name is.  A name
that would only be of interest to a small group of people is not as
valuable and a name that would interest an "industry" as a whole.  And
last but not least, .coms usually sell for higher prices.

There are several companies making money buy selling domain names.  If
they were not making money, I doubt that they would be in the business
very long.  Besides, if you buy the name for $8 and sell it for $500,
that's a sizable profit even if you only sold 10 a year.

Just my opinion
jack@klicktheweb.com
http://klicktheweb.com
http://wesell-domains.com

the domain propertydubai.com would go well as there are many companies
in real estate here that are making a lot of money!!