The front yard, no unless they use it and remove it and not leave it there, that depends on the neighborhood and area too.

Photo here: http://1drv.ms/1UUdfkT - Is this a normal type detector or something odd that should be removed? 

I got a quote for two guys to work for eight hours (all their own gear) for $450 ... that was on a two story brick house, almost entirely square.That's just for a clean, if you want them to power wash it to strip paint, or to remove years of grime and gross, it would certainly cost more.

My neighborhood, Gresham Park, has been trying to get them to remove us from the map since 2015, and we were told no. 

A lot depends on the jurisdiction and their enforcement.I removed a closet in one of the bedrooms of a two bedroom house.

I have a form called Add/Remove Tenant from lease.

The only major change would be removing a wall oven and replacing with cabinets, and putting a oven range where there is currently a cook-top in the counter top. 

Don Trumps hair

I recommend that you use a local purchase agreement (like the ones used by Realtors but just remove all the realtor information and keep the legal jargon).

I had a lot of staples and tack strips to remove though.