Way back when, in the early 2010s, I worked on a book of 35 in-town walking tours.

More recently, its publisher decided it needed a complete updating.

That’s been completed, and the new “Walking Seattle” is now out.

But my purpose today isn’t to plug. It’s to look back on that “simpler time” in a simpler city, and sort out what the heck happened.

It’s been seven years from the original edition of “Walking Seattle” to the new one.

What’s changed in Seattle in that time?

A better question: what hasn’t?

The Jet City’s beautiful geographic features are still here: the setting on a salt-water inlet, the lakes, the waterways, the hills.

And the major public attractions are as cool as ever: the University of Washington, the Pike Place Market, the Arboretum, the Ballard Locks, all the parks.

But so many other aspects of Seattle’s “built environment” have changed in these past years. They’ve changed more, and faster, than they have in almost a century.

The population, which had dipped below 500,000 in the 1980s, is now over 720,000.

All over town, what used to be quiet commercial and industrial streets are now blossoming with office, condominium and apartment complexes, from 5 to 40 stories tall.

Even in the city’s vast “single-family home” zones, where most other land-use types are forbidden, smaller houses have been replaced by bigger houses, and bigger houses have been replaced by townhome triplexes and quadruplexes.

Throughout the city, dozens of beloved independent shops, restaurants and bars have fallen to demolition and redevelopment at their locations, or to rapidly rising rents. Others have been lost to the usual turnover rates for small businesses.

Some time early next year, the Alaskan Way Viaduct, the elevated highway that’s been the backdrop to Seattle’s central waterfront for almost 70 years, will get demolished. After that, the central waterfront will undergo a big redo, which will likely erase the last physical vestiges of the old industrial harbor.

And next year starts what city officials call “the period of maximum constraint,” when a whole bunch of construction and road projects all happen at once, blocking traffic even further. Besides the waterfront rebuild, we’re getting an (almost) all-new arena where KeyArena is now, and the Convention Center is getting some giant new annex buildings. More long stretches of major arterial streets will be torn up, then repaved and/or reconfigured.

And speaking of transportation: Oh! The traffic! Greater downtown (which essentially now encompasses a lot more blocks than it used to) can be a nonstop (or rather “mostly stop”) traffic jam all afternoon and early evening.

Thankfully, Seattle’s still a great city for walking.

It’s rarely too hot for a serious walk, and it’s even more rarely too cold.

As a self-styled “city of neighborhoods,” almost all of Seattle’s major walkable attractions can be grouped into discrete walks of workable lengths.

Seattle’s hills can sometimes be a bit steep, but they reward you with magnificent views. (And you can always start at the top and work your way down, as many of the walks in “Walking Seattle” do.)

We have waters big and small. We have two mountain ranges. We have light and heavy industry (still). We have dedicated walk/bike trails, wooded paths, park boulevards, quiet residential lanes and lively shopping streets.

We have more (and more different kinds of) dining and drinking spots than ever. They’re serving everything from poké and artisinal ramen to

And we have several new, walkable attractions: The “Marketfront” addition to the Pike Place Market. The Amazon Spheres. Chophouse Row and Pike Motorworks, two urban mini-malls on Capitol Hill. The Chihuly Garden and the KEXP Gathering Space, both at Seattle Center.

We’ve got a growing light-rail line, and more bus service than ever, so you can get to all these pedestrian places without adding to the ongoing traffic mess.

So: leave the car and the traffic behind.

Get out and see what’s still one of North America’s most beautiful big cities in the best way, by foot, live and in person.

Clark Humphrey is a columnist on Seattle culture. “LOSER: The Real Seattle Music Story” is now available from miscmedia.com and other online sources.