When wanting to plant so many trees on a small half acre lot which is also taken up by a house footprint, it is best to consider planting more like what would be seen in the forest. First, planting the upper story trees planted in consideration of how they will cast their shade. Dappled shade is wonderful to create with the right overstory trees. Then, wait until those trees grow large enough to have a canopy that spreads far enough to shelter the ornamental dappled shade loving, understory trees along with the part-sun loving understory trees that like to grow along the outside edges of forested areas. It never ceases to amaze me how beautiful, forests can be. Many of them seem like a master designer, skillfully, planned their tree, shrub and brush, spacings, positions, and species. Yet, I know you must have more ability, compared to nature, for planning a viable forest environment? Just take the time to consider what arrangement a forest needs to survive, and to provide a forest floor which is compatable for human occupancy. Above all, stay mindful, of the difference between wild areas that keep wanting to invade human settlement areas, compared to the forests which retain their own eco space, and advance outward slow enough; that it takes little effort from human settlement, situated within the forest, to keep the wild outside the settlement's boundries.

I think you did great. I have an Autumn Blaze Maple next to my patio. A nurseryman told me also the Pear was a good choice for close to the house which I assume the patio is also. It would not bother foundations, cement, and didn't sprawl all over.

bathroom sink

I agree with Christopher. Established residential properties often have an "eclectic mix of old trees". In fact, "eclectic mixes" or a collection of various species is typically the norm rather than the exception! I seldom suggest removal unless the trees are unhealthy/in decline or blatantly improperly sited. Often it is helpful to treat them as the specimen plant (or singular, unique feature) in a particular location and then anchor them with other, smaller plantings that will tie them together. Could be as simple as a groundcover or as mentioned above, the repetition of other, smaller plants throughout the garden. In a smaller LA garden, removal of any turf and replacement with hardscaped walkways and a groundcover might be all that's required. The trees will look unified and the garden will be calm, uncluttered and low maintenance. Or if you have greater space than I imagine, it is possibe to create a series of individual garden 'rooms', each featuring a particular tree, and turn each 'room' into its own character. Much more design effort involved, a bigger plant palette needed and increased maintenance required.