Perfect! I'll chop up the building and then you can apply any shops or the like. The relation editing is best accomplished via the advanced JOSM editor.

Hey, coincidentally, Baltimore County GIS has published data just today that you can use for mapping subdivisions. This map shows "Conveyences" which are groups of plats (aka subdivision plats) in County GIS jargon. The boundaries are official, however. In the past, I received permission to use County data for OSM (such as all of the buildings on the map). I believe this still applies, so feel free to reference this map for mapping subdivisions. http://data-bc-gis.opendata.arcgis.com/datasets/217c84d9ed914b01afff255f8abf950f_2?geometry=-76.682%2C39.422%2C-76.602%2C39.433

Looks good! I was just over here the other day and scouted a tiny path between that northern edge of the parking lot and The Meadows Neighborhood. Those types of things are useful to add--unofficial type paths, as it helps ped routing software find routes.

Would you say that the way the pavilions are split in this photo is representative of how you'd split them? https://goo.gl/photos/wEbpoGr8T5jCX5GU9

This situation is pretty unique to Baltimore County and that the mapping community, unfortunately, does not have a great answer for. Baltimore County is somewhat unique in the US in that there are no incorporated towns in it. Thus, things like Towson and Timonium don't have any official existence at the local government level. However, two federal entities define these places differently: the USPS and the Census. The USPS ZIP Codes associated towns (the list you cited) are how people identify with a place here. However, the Census, strangely, has decided to break up the 21093 area into these three zones, and the boundaries are not the same. A few years ago I attempted to streamline the hodge-podge list of towns and villages in Baltimore County objectively, by population. However, as you point out, this numbers-only definition doesn't exactly mirror the situation on the ground.
I think that we should go ahead and make MC a village, and then Timonium a town. I always thought of "Lutherville" as the area south of Ridgely that is mostly residential, thus maybe that should be a village. Timonium, meanwhile, does have an urban core of sorts around the fairgrounds. What do you think?

TJ, that is a great point, and I'm glad you made it. I am happy to help out. Place classification is a contentious thing in the community so I do apologize if it seems harsh. Often times we'll see edits where someone will reclassify every town or do some mechanical edits. In the past, we had Lutherville-Timonium combined as one place. The census chopped them up and now classifies Mays Chapel separately. However, as you pointed out, there is no real "urban centre" in Mays Chapel. At best, you might call it the shops along Padonia. Given this point, I think that perhaps the population alone shouldn't be the deciding factor. Do you want to join our Slack channel to discuss? I think you'd find lots of helpful information there, and good people to chat with about the map. Cheers - Elliott

Good work here! If you know of some more neighborhood boundaries to add, the community welcomes these kinds of additions.

Hey there, solid work on these edits. I added the connecting sidewalks to show the standard for mapping these kinds of features. Make sure that your footpaths connect to another highway-way. This allows routing across the network. Thanks!

Hello again. Have you visited Greenspring Valley lately? I was just there and removed the raquet club as a building and change it to construction because that building is being demolished. The parking lot is also closed. While the community welcomes contributions, we'd ask that you don't change the status of a building or landuse without checking it out in reality first. I'll go ahead and roll this one back. Thanks!

Hello again and thank you for your contributions. These particular changes are not appropriate, however. As you may know, Lutherville, Timonium, and Mays Chapel are not incorporated towns, nor are any in Baltimore County. The OSM community has discussed this at great length and reached the (somewhat arbitrary) conclusion to let the population of a CDP be the guide to the difference between hamlet, village, and town. In Baltimore County, any CDP with a population of less than 10K is a village. Anything over is a town. If you're interested in discussing more, feel free to discuss with the Maryland community on OSM. Look us up on the OSM wiki. Thanks!

Hello there, I can address this. The names you see on various maps are governed by the style guide for those maps. The data itself is correct though. What map do you see this issue on?

Hello and welcome to OSM! Thanks for contributing. I see that in this changeset you removed the Heatherfield neighborhood. If you have knowledge that this is not a commonly used name, feel free to remove the name, but leave the polygon. I went ahead and added back the polygon without that name. Thanks!

These tags with the builder name are pretty cool. Bravo

Awesome, thanks for looking out! I think that the prohibition might be a paper one. Let me know what you find.

Good day. What does the changeset comment, "..." mean?

Hello again. Thanks for reverting. The Bing imagery is old here, perhaps 2013? You can use this handy overlay tool to check the date of the Bing imagery: osm.wiki/Bing_imagery_analyzer_for_OSM

Hello there. The source data for this edit is all outdated. Would you consider reverting this edit? If you take a look at the Mapillary data here, you will see that the way that the map used to look was correct.

Hey there. I noticed you deleted the existing ways in this changeset. Why delete them and do it over?

forgot to mention in changeset: reviewed road types around the Tudor farms site and changes some to track / service depending on their appearance

I only learned of it when trying to figure out what those crazy triangles are for