Do not apologize for your bungalow! They are wonderful. It's great you are taking up the challenge of restoring one. 'Silver Sheen' is a gorgeous airy tree, but it struggles away from the coast. SFV I think it might be too hot for it, but look around your neighborhood and see if any are growing and thriving nearby. If you see some that have been there more than five years and look great, a definite option. For the dense area I would look at Syzygium paniculatum, which for decades was the ideal narrow screening plant for Southern California; this all changed when a psyllid arrived that ruins the foliage, HOWEVER, the state released a psyllid-predator that seems to be keeping the psyllid under decent control; you get some damaged foliage, but not enough to make the plant look particularly bad or kill it off. Let them grow to the height of your neighboring apt building or a few feet shorter, then top and shear as a hedge. Quite drought-tolerant once established and do not plant too close to the fence, 4 or 5' apart and at least 4' from your fence. If you keep them topped and trimmed, they will be happy and well-behaved for decades to come. The Syzygium you see would be historical to the youth and middle age of that bungalow. A another really classic choice would be Hollywood Juniper, Juniperus chinensis 'Torulosa', which was so popular 1920-1970 it got named after Hollywood. Another historical choice for the dense portion, if you can sacrifice some space, would be citrus trees, which are also beautiful ornamental trees--a lot of people forget that, not to mention the out-of-this-world fragrance of the blossoms. They made nice screens and do not get too tall (avoid grapefruit--they can get huge, unless you get one on dwarfing rootstock). Choose a citrus you are going to enjoy eating, not an oddity with fruit you don't know what to do with. For the airy, you have a lot more choice. Look at some small, choice palms (NOT trashy, reseeding-everywhere-pest Washingtonias, which end up costing a fortune to trim and are habitat for rat infestations, avoid!). For example the Mexican blue palm, Brahea armata. Some of the smaller Crape Myrtles are lovely. See "patio trees" section in the Sunset Western Garden Book for more. Your lot is probably too small for a larger tree and a large tree with ruin the look of your bungalow by overwhelming it proportionally. Medium shrubs (20-30') can make excellent shade and screen for bungalow properties.

I'm with Mad_gallica and Kentrees that you should move the gate so it isn't centered on what you don't want to look at. My mixed shrub border had slightly different goals than yours, but the general idea was the same - a way to block an unattractive view. My area had a height limit of 20' or so since we have solar panels behind this, so my particular plants might not work for your use, but having a green wall of only one or two species in such an informal rural setting looks really artificial to my eye, so you might want to consider spacing the trees you have out to closer to their ultimate width, and filling in rows (staggered front to back - see photo 2) with different evergreen species/selections and denser deciduous trees & shrubs so it looks less formal. As someone suggested above, you can do groups or clumps of plants with different heights and species. (Add some bamboo screening - comes in rolls - on and above the fence for now to block between the trees until things fill in a bit.) I used three staggered rows of plants with repetition of several types of evergreens down the length. The bed is about 15' deep and 60' long give or take 10'. Looking NE from the SW side (June 2010 - planted October 2009) In December of 2010 after one full growing season looking west from the dirt pile just visible on the right (east) edg e of the photo above After 4 growing seasons with some added perennials but not much in the way of added shrubs it is fairly full. Late October 2013 Looking down the back side as fall color is just beginning to develop - no perennials since this is the work area side. Here's a photo in taken late November 2014 that was from a similar angle to the second photo at the top. Remember that vehicle traffic on a drive needs less height to block it from view, while you will want more height where the barn is. So perhaps center one spruce on the barn from your most frequent viewing spot and place the other to block the barn from the next-most viewed spot. Randomly space the arborvitaes along the remainder of the length, with some clumped or staggered front to back, again thinking of their ultimate size and your viewing spots. Then get some large shrubs/small trees to add in to hide the view of the drive, considering how densely branched they will be, whether there are flowers or colored foliage or interesting winter features. So something like one of the really large rhododendrons like Roseum elegans might work to block views of the drive (evergreen, flowers, and dense) while you could put a lilac (densely twiggy in winter, spring flowers) slightly offset from one of the evergreens and in a different plane, either set closer to the fence or farther from the fence than the evergreens.

Similar thing here, on east coast and looking for a 4 panel stacking door for a 12’ wide opening. Looking at Nanawall and Marvin. Local to us, Marvin has excellent rep and service and installation, I would likely use them if for no other reason than I would hope they would be responsive to any problems or service calls, and would send out help to make sure it was being installed correctly. I don‘t know how nanawall would handle this without a local source. Marvin has helped with every little problem ever, but I don’t know if Marvin is making the stacking doors themselves.

Someone mentioned the clumping bamboo. We lived in LA and had an old ranch house torn down on the uphill property behind ours. They put up a 2-story house that looked like 3-stories from our rear patio that was downhill from them. We quickly removed some lemon trees we had planted in the back and replaced them with Bambusa Oldhamii. We bought 24" boxes that were already around 16 ft tall. It only took a couple of years, with some extra watering and feeding, and we quickly had a 40 ft hedge. We were able to completely block the new house. It is a clumping bamboo and can be controlled by cutting new shoots or the older taller ones.