Needs sharply focussed, close-up pics of the undersides of the leaves to show the position, colour, and density of any pubescence. Possibly Crimean Lime Tilia × euchlora, but that's far from certain.
Down here T. x euchlora is rare but multiple examples are know. However, recent plantings under the name are often T. americana 'Redmond'. This latter should produce some typical oversize basswood leaves whereas T. x euchlora does not.
Indeed, it's same situation here with Tilia x euchlora (i.e., rarely cultivated compared with T. cordata cultivars and the ubiquitous, boring T. x flavescens 'Glenleven'). The yellow leaves made me think of the T. x europaea cultivar, 'Wratislaviensis'—a beautiful tree. To be honest, I've never seen it outside Europe, but the Kootenays often has a few surprises. I know I'm getting off topic here, but Alan Mitchell, in his little-known book, The Guide to Trees in Canada and North America, notes a large planting of T. x europaea "outside Vancouver on Rt. 99" and some in Stanley Park. And the most recent inventory of Riverview Arboretum (in Coquitlam, outside of Vancouver) lists about a hundred common limes. Interestingly, none of these plantings is mentioned in any regional tree books that I have consulted.
I think the 'Wratislaviensis' should be more yellow, with yellow shoots. Forestfarm has listed it. Jacobson (Trees of Seattle - Second Edition) mentions no 'Glenleven' (and very few 'Dropmore') so that may be one of those differences between Vancouver and Seattle tree assortments.
