Not anymore, they got rid of the tower building concept during their recent renovation!

As with others, I generally find that when there is a lounge I have access and that will be the experience as Platinum and above (excluding Ritz Carlton), I also find it fairly rare that there is some "sub-standard" lounge being offered as an alternative, this isn't Qatar Airways. I do appreciate that Tokyo may be a bit tougher, but quite a few of the properties (e.g. Courtyard Ginza) will give you benefits beyond the brand minimum (like a full breakfast in this case), and the Autograph Prince hotels do give lounge access too (even to two lounges in different nearby hotels).

Not sure if AJNEDC you have a credit card, but getting a cheap credit card (Free) that gives you 5 nights would get you over the line, and also presuming that is your 50 nights, give you 5 upgrade vouchers (or a few other choices) as an annual choice benefit. This may also have benefits to be worth a 3 night staycation somewhere nearer your home, if the credit card didn't appeal - plus the status will be valid for the year you earn it and next, so other chances to use the benefits.