Heptacodium miconioides--Seven son flower. Fast growing to 20 ft, pest and disease resistant, multi-stemmed with interesting bark, vase shaped, fragrant white flowers in late summer followed by long show of red calyxes. May need a little pruning and shaping the first two years. Great plant!

High Bush Blueberry is a very colorful bush in fall. Has smaller flowers in early spring, nice edible blueberries in summer. Not sure of your location, but these do best below a line across the state, even with Grand Rapids. North of that line, they plant low bush blueberries. You could check varieties, the High Bush get up there if not trimmed. I think they grow fairly quickly, are pretty inexpensive. Terrific fall color, berries for the birds if you don't pick them.

Another flowering bush would be Doublefile Viburnum. Not real fast growing, but ends up a larger bush with great spring flowers. The ones I have seen are just beautiful, covered with flowers. Good height and width at maturity. Again, not terribly expensive, but you would need growing time. My little one has nice color in fall. May need some watering in dry spell when small.

I have an Elderberry shrub. It grows about 10-12ft tall each year. It started very small, 2ft, stayed that way for 2 years, then went wild! I trim it down to the 2ft height again in spring, then it sends out new growth to get the height. Has very lacy leaves, with large, white, plate size flat flowers in early summer. They turn into small dark berries towards fall. It is a little airy, but I have it in semi-shade. Not sure what full sun would do. Dirt is a little heavy there, so holds moisture a bit. Giving drinks doesn't bother it any. My Witch Hazel beside it needs more water, so they haven't done drought. I like it for the lacy look, pretty flowers. Spring trim is easy, cut off wherever you like, new growth comes up from the old sticks. Straight sticks, not tangled wood.

Maybe one of these will be helpful.

I've been growing highbush blueberries for more years than I can count, and I find them very slow growing. They are as wide as they are tall, in my garden. If any of them are going to make it to 20 feet, it will not be in my lifetime; it may be the varieeties I'm growing, though. They are best planted when small, as they suffer from transplanting once they've reached any size.

Heptacodium may not be hardy in your part of MI - if you included your zone we'd be able to be more helpful. If you're in zone 6, then I agree, it would fit the bill perfectly.

Cornus mas might work, it's hardy to zone 4 and can reach about 20 feet. Not terribly fast growing, it is usually narrower than tall, but not always! It's a very low maintenance plant - like other slower-growing shrubs it doesn't drop branches (that's usually the problem with fast growers like your pear).

There are also many types of lilac that will have the same form as heptacodium, tall and narrow, that are hardier and less expensive. You'd need to do some research to make sure you get one that will be the right height/width at maturity.

Taking out the Bradford was a good move, by the way.

Doublefile viburnum, while perhaps the most beautiful of all the viburnums, will also not fit your bill. They typically grow about 6-7 feet tall and twice as wide, with a horizontal branching structure.

And I believe that Heptacodium is fully hardy through zone 5.

Acer ginnala, Amur maple, grows to about 20' - I don't know how fast though. A. tataricum, tatarian maple, grows to 20-24' - may be too hard to find. Amelanchier spp., serviceberry, will have the height, in a tree-form selection, and 3-season interest with flowers, fruit and winter shape, but may be too airy with the leaves off. If there is a dwarf birch (dwarf in the sense of not growing to 40'), it might be a good choice. A selected crabapple might be a good choice also - color from blooms and perhaps leaves and fruits, but would have to be fairly big initially to get the height you want in a reasonable time frame (well, most of these will have to be as large as you can afford initially to get the blocking height in a few years, rather than in 6-10 years!). Sorbus spp., mountain ash, might do if disease isn't a problem in your area - again, you get flowers and fruit. A tree lilac might be possible, spring blooms, but little interest otherwise. Cornus alternifolia, pagoda dogwood, at 18' may be too small - the flowers are less interesting than common dogwood, being small-petaled, flat clusters, but it fruits, and the branch structure is interesting in winter.

I would check and see if your county's cooperative extension agent (look in the phone book under gov't offices) has a list of trees suitable for your area, with mature heights given. That would at least give a starting point, and you SHOULD have some chance to find them locally. Anything you have to mail-order will, of necessity, be small.

Another thought I had - I don't know how much room you have in your yard, but a taller tree, planted further away, will also screen the view, without blocking light in the windows in summer. If you WANT the summer shade, then forget that idea!