I have the laugh at that "review" by those reporters. Obviously they are appraising it at its CURRENT value, and most Catholic Churches are older than your great grandmother. you so have a problem.
When assessing how much a piece of property is worth, it's current value is the relevant measure.
Secondly churches aren't easy liquid assests like houses and other lands, where you can just immediatly sell them, because they tend to the community and go through a special process.
You mean the special process the church sets up for itself as a barrier to sale? Because civil law doesn't place any special restrictions on the sale of parish property (that I'm aware of anyway .... which isn't saying much

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Secondly they don't even know if all that property is still owned by them. Like I said if that was true churches today wouldn't struggled just to pay for heat and maintinence. Did you even read the reply to that false article?
Nothing in the response you posted claimed that the listed property was owned by an entity other than the church. Rather it defends the holdings by claiming that some of them are still being used by the church; that real property is not "instant cash"; and that some of the space is leased for uses that benefit that community -- like public schools and nonprofit groups.
I agree that if the church is using the property as a place of worship or for a charitable purpose, it makes sense for it to continue using it. However, observing that real property is not "instant cash" because it takes time to sell that property is not a compelling argument -- the sale process only decreases the property's value by the cost of sale. The fact that some of the space is being leased for community friendly uses is also not compelling. Unless the church is charging heavily discounted rents I don't see how that's any different than a regular old landlord who rents to organizations we may all approve of.
And again, I posted the article in response to your claim that the Church only maintains "Christian relics" and "historical data and architecture". Although I guess anything built at any point in history (including an hour ago) is technically "historical", but I think that's a tortured (and probably unintended) reading of the word as you used it.
And when the church really wants to get rid of a piece of property it's able to do so at least some of the time, even if (as with all development projects), it requires a little sweat equity.
Take the case of 1280 Washington Street, for example. If you click
here, you'll see an entry in the Suffolk County registry of deeds for a notice dated April 2001 relating to the above mentioned Washington Street address and the Archdiocese of Boston. You can then click on the "Quick Document Viewer" link on the bottom of the page to view the notice itself, which is a decision from the city board of of appeal granting the Archdiocese's request to convert the historic St. Vincent de Paul building (which was being used as a space to sell salvage goods for charity) into a 6 story mixed use condo / restaurant space with 7 off street parking spots. Looks like the plans went through just fine, since the penthouse at
1280 Washington is currently on sale for $4.9 million (not through the church, of course, since we're well into resale land with these condos now).
Here's another one (again, click on the "Quick Documet Viewer" button), acknowledging the Archdiocese's request to convert church owned property at 100 Rogers Street in Lowell, MA, into 8 new condos. The property was
sold by the Archdiocese to "100 Rogers Street Inc" for $555k in 2005.
EDIT: Oops, looks like the links I posted above don't work because they're dependent on a timed session at the recorder's website. You can do your own search for the properties if you like and see the docs I reference, since they're a matter of public record.