Man can never prepare for what is to come. San Francisco warned in the 1900

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Catastrophe-proof Buildings Will Become Ashes

I have seen the most costly structures in buildings erected and supposed to be fireproof, and just as Sodom perished in the flames of God's vengeance so will these proud structures become ashes. . . . The flattering monuments of men's greatness will be crumbled in the dust even before the last great destruction comes upon the world.--3SM 418 (1901). {LDE 111.6}
God is withdrawing His Spirit from the wicked cities, which have become as the cities of the antediluvian world and as Sodom and Gomorrah. . . . Costly mansions, marvels of architectural skill, will be destroyed without a moment's notice when the Lord sees that the owners have passed the boundaries of forgiveness. The destruction by fire of the stately buildings, supposed to be fireproof, is an illustration of how in a short time earth's architecture will lie in ruins.--TDG 152 (1902). {LDE 112.1}
Men will continue to erect expensive buildings, costing millions of money. Special attention will be called to their architectural beauty and the firmness and solidity with which they are constructed, but the Lord has instructed me that despite the unusual firmness and expensive display, these buildings will share the fate of the temple in Jerusalem.--5BC 1098 (1906). {LDE 112.2}

A similar caution was given in regard to building in Los Angeles. Repeatedly I have been instructed that we must not invest means in the erection of expensive buildings in cities.--PC 50 (1906).

Other Wicked Cities

As we near the close of this earth's history, we shall have the scenes of the San Francisco calamity repeated
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in other places. . . . These things make me feel very solemn because I know that the judgment day is right upon us. The judgments that have already come are a warning, but not the finishing, of the punishment that will come on wicked cities. . . . {LDE 114.4}
[Habakkuk 2:1-20; Zephaniah 1:1-3:20; Zechariah 1:1-4:14; Malachi 1:1-4, quoted.] These scenes will soon be witnessed, just as they are clearly described. I present these wonderful statements from the Scriptures for the consideration of everyone. The prophecies recorded in the Old Testament are the word of the Lord for the last days, and will be fulfilled as surely as we have seen the desolation of San Francisco.--Letter 154, May 26, 1906. {LDE 115.1}
I am bidden to declare the message that cities full of transgression, and sinful in the extreme, will be destroyed by earthquakes, by fire, by flood.--Ev 27 (April 27, 1906). {LDE 115.2}
All the warnings of Christ regarding the events that will occur near the close of this earth's history are now being fulfilled in our large cities. God is permitting these things to be brought to light that he who runs may read. The city of San Francisco is a sample of what the whole world is becoming. The wicked bribery, the misappropriation of means, the fraudulent transactions among men who have power to release the guilty and condemn the innocent--all this iniquity is filling other large cities of the earth and is making the world as it was in the days that were before the Flood.--Letter 230, 1907. {LDE

Labor Unions in the Cities acting up.

     Satan is busily at work in our crowded cities. His work is to be seen in the confusion, the strife and discord between labor and capital, and the hypocrisy that has come into the churches. . . . The lust of the flesh, the pride of the eyes, the display of selfishness, the misuse of power, the cruelty and the force used to cause men to unite with confederacies and unions--binding themselves up in bundles for the burning of the great fires of the last days--all these are the working of satanic agencies.--Ev 26 (1903).  {LDE 116.1} 
     The wicked are being bound up in bundles, bound up in trusts, in unions, in confederacies. Let us have nothing to do with these organizations. God is our Ruler, our Governor, and He calls us to come out from the world and be separate. "Come out from among them, and be ye separate, saith the Lord, and touch not the unclean thing" [2 Corinthians 6:17]. If we refuse to do this, if we continue to link up with the world and to look at every matter from a worldly standpoint, we shall become like the world. When worldly policy and worldly ideas govern our transactions we cannot stand on the high and holy platform of eternal truth.--4BC 1142 (1903).  {LDE 116.2}  

 The Signal for Flight From the Cities

     The time is not far distant when, like the early disciples, we shall be forced to seek a refuge in desolate and solitary places. As the siege of Jerusalem by the Roman armies was the signal for flight to the Judean Christians, so the assumption of power on the part of our nation, in the decree enforcing the papal sabbath, will be a warning to us. It will then be time to leave the large cities, preparatory to leaving the smaller ones for retired homes in secluded places among the mountains.--5T 464, 465 (1885).  {LDE 121.1}