If you haven't been back to Nationals Park or the surrounding Near Capitol Ballpark River Yards neighborhood since last year's Opening Day, here's what you'll see that wasn't completed on your last visit:

* 55 M Street - Right on top of the west entrance of the Navy Yard Metro station, at the head of Half Street, is Monument Realty's 275,000-sq-ft office building, which has been finished in the last few months and which will be home to Artomatic this summer. No office or retail tenants have been announced, although WBJ reported a few weeks back that Gordon Biersch may be eyeing some of 55 M's ground-floor space. The rest of Monument's Half Street site remains a large hole in the ground, with financing for the planned 350 residential units and adjoining hotel directly across from the ballpark nowhere to be found.

As for what's currently underway, there's the first phase of townhouses at Capitol Quarter (where the first residents will move in this month and where work will continue into next year), the 200-unit Velocity condo building at First and L, and the 440,000-sq-ft office building at 1015 Half Street (which will be completed in 2010 but will already be cursed for obscuring the view of the Capitol dome from some seats in the ballpark that had it last year). There's also construction continuing at Diamond Teague Park, right across from the ballpark's grand staircase, but the somewhat optimistic timeline of having the water taxi piers completed by Opening Day has now been revised to "midseason."

Work had begun on rehabbing the brown-and-white Pattern/Joiner Shop at the Yards last year (which folks walking to the ballpark from the Nats Express drop-off will see), but financing problems brought the work to a halt early in 2009, and Forest City continues to look for money to restart the project.

The most prominent structure that's disappeared in the past 12 months is the former WMATA bus garage on Half Street just across from the subway entrance, demolished two weeks ago to make way for Akridge's planned 700,000-sq-ft mixed-use development, though that project won't get underway before 2010. (The south end of Akridge's Half Street land is where the [not-a-]beer garden may appear later this summer.)

But, as has been written about extensively elsewhere, as of now there's no new places to eat since last year (though a deli is coming to Third and K in May), and most likely no additional projects will get underway before next year.

So, study this little guide and amaze your friends with your knowledge of what's what as you look at the ballpark's surroundings.

* The demolition of the old WMATA Southeastern Bus Garage at Half M continues; they had reached as far north as just across from the subway entrance at around 11:30, so the M Street facade could conceivably be gone by the end of today or early on Tuesday. You can see a couple of photos (like a bigger version of the one above) on my Akridge Half Street page, though the photos won't be as striking until the demolition reaches M Street.

* A nice fellow working at the schoolbus parking lot at Canal Park told me that the buses are being moved to their new home at DC Village on Saturday and Sunday (April 4 and 5), with drivers expected to report to work at the new lot on Monday morning, April 6. So, it does indeed sound like this is the last week of the Sea of Yellow.

* Look Mom, a Circulator bus! (This is the stop at First and K, before it turns right on I and circles back down New Jersey to the subway entrance.) You can see it lurking in a few other updated photos I took at New Jersey and M. UPDATE: There apparently was a boo-boo with the information on the DC Circulator site--the bus will be running from 6 am to 7 pm weekdays (it had said 6-6). They've also updated their service map to correct some errors.

* Here's my first shot of the repainted Third and K Market (now to be known as the Corner Copia Deli). You can compare it to its old profile here.

* The Nats are having a "soft launch" for their new food concessionaire (Levy Restaurants) via a series of invitation-only events this week. Tonight employees of the Navy Yard will be sampling the new food, and there will also be events on Tuesday and Wednesday for local businesses and invitees of the BID. On Friday the media will get its shot. I will report back later in the week, though I won't be able to provide doggie bags for everyone.

UPDATE: And, as reported in the comments, the building has been painted today and is now a grayish-olive. Glad I got one last batch of pre-paint photos! Will post new ones in a day or two.

* Reader atweber passes the news via Twitter that workers have told him that the Third and K Market will be opening next month. So, those wishing to stay in the neighborhood to shop won't have to use CVS as their "supermarket." (And the new windows and door are so pretty!)

* Not officially confirmed, but the WashTimes is reporting that President Obama has agreed to throw out the first pitch at the April 13 Nationals home opener.

* Via the BID's latest newsletter: the little beige building at 900 M Street that once was a Hudson car dealer (and more recently a dialysis center) is scheduled to open in April in its new incarnation as a retail building. It's said that the owner has received one letter of intent from an undisclosed tenant. (Just speculating, but maybe it's the Dunkin Donuts franchise that was reportedly looking in the Navy Yard area?)

* The BID has also announced the lineup for this summer's lunchtime concert series at the plaza behind USDOT, though you have to page through their calendar to see the schedule of artists. It runs on Wednesdays at noon from May 20 through Sept. 16.

* When I posted about FiOS internet at 70/100 I and asked "is this news?", I should have referenced this post from last summer, about the "First Community to Offer FiOS" sign on Half Street, where we discussed that FiOS internet was already listed as available at those addresses on the Verizon web site.

* The day after I posted about the calls from Nancy Pelosi and Harry Reid to convert the Capitol Power Plant from coal to natural gas, ABC7 reported that "several thousand demonstrators "urged Congress to pass legislation to reduce greenhouse gases, and they targeted the government's own Capitol power plant as a symbol of the problem. An enthusiastic crowd of mostly young people marched from a park near the Capitol to the power plant several blocks away, where they planned to block entrances and were prepared to get arrested. The group chanted along the way, 'We don't want the world to boil, no coal, no oil!'" Darryl Hannah and Robert Kennedy Jr. were among the protestors. When they arrived at the power plant they were met with "about a dozen" pro-coal counter-demonstrators.

* On Thursday the Post looked at how the office building development biz in DC has all but ground to a halt: "Not a single office building has been started in the District since October, a sign that the slowdown that began in the far-out suburbs has now reached prime city locations." The Hood (surprisingly) isn't mentioned, though WBJ reported a few months back that Donohoe was looking for (but unable to secure) funding for 1111 New Jersey.

* DDOT told me these were coming a long time ago, and a reader whose e-mail I've lost gave me a heads up a few weeks back, but now I've finally visited for myself to see that the ugly cyclone fences on the South Capitol and M overpass have been replaced with pretty gray-painted ironwork.

* You have to look kind of closely, but construction has indeed started at Capitol Quarter, with pretty new curbs being installed on the south side of L Street between Fourth and Fifth. You can see them if you squint at the photos on my Capitol Quarter Phase I page.

* The owner of the Third and K Market at, um, Third and K must be keeping track of what's going on nearby, because there's now a For Rent sign tucked in the door. (Alas, all the info sheets were gone when I got there.) If you've ever dreamed of running a corner market, here's your chance. The market's been closed since about 2006.

* The "Wachovia Coming Soon" sign is back in the window at 20 M, so my building permit reading was on the mark. (It's in the window on the far western edge of the building.)

UPDATE: Speaking of 20 M, GlobeSt.com is reporting (tucked in a piece on LEED Gold certification for 1100 New York Avenue) that several leasing deals are pending for 20 M. So perhaps that's why Wachovia has decided to start moving forward.

* I did a bit of needed housingcleaning to the home page map and project directory--adding in 88 K as a "featured project", demoting 1345 South Capitol to "star-only" status until the project starts moving forward again, and adding a few additional stars for projects like the coming retail renovation of 900 M Street.

I also did some updating of the tabs with the lists of projects--if you don't realize the tabs are even there (look just above the map for "Residential/Office/Retail/Hotel"), take some time during this lazy summer to click on them and be stunned and amazed by the easy access to project information....