Well, I think it's pretty clear if you go back to the '08, '09 timeframe that there will be tenants and oftentimes they tend to be small publicly-held companies, either preclinical or into the clinic, who have a certain amount of cash that are trying to kind of manage their resources to get to value inflection milestone so they can either finance further or potentially reach a milestone that they could partner or sell either the company or the product to a bigger company. And so, I mean that goes on all the time, and I'm sure we'll see that evolve from time to time. I mean, the great example that I like to use as a company that had that problem back in '08, '09, they moved out of a big -- actually, they had the entire building of 500 Forbes, they moved out on one day, the next day, Genentech-Roche took that entire space and I think that's what you see we've described, I think last time, Steve described on the last call a tenant in San Diego, or maybe we've done that on some of the analyst calls, that wanted to leave, I forgot 20,000 square feet or so. We brought in another tenant who wanted that space and the mark-to-market on the new lease was 50%. So we expect to be able to manage those kinds of issues. But I think we're going to be much better well set than almost anybody else because of the discipline we've used in leasing space in the first place. Now if we buy an asset where we have an existing tenant, and that actually happened at 500 Forbes, then we have to just manage that in a way that is as best we can, because we haven't underwritten a tenant in a sense of choosing them, bring them in or not, obviously, as part of the acquisition. But so far, if you look at collections, receivables and just the general situation across the portfolio, we don't have any credit issues at the moment.