Here's my draft for a revised version of Tasia's lab.
Weirdly, the errata'ed lab Build Points rule makes it very difficult to buy a lab worth 10 or 20 points, unless it has a positive Refinement: if you balance the Virtues with Flaws, you get 0 points, and if you need an extra point of Size to install a Minor Virtue, you get 30 points, 20 for the size and 10 for the Virtue. Gregorius's lab doesn't have that difficulty because one Minor Virtue has already been paid for as a Magic Item. Viola's doesn't have that problem because she's leaving one point of space unused. It looks like Tasia went a similar route, leaving all the extra space vacant, so I'll just go with that--that'll make each of the three member labs 20 points.
Wow, there's something I missed before: Superior Equipment and Tools give Safety bonuses, while the Flawless varieties don't. I'm going to go ahead and start Tasia's out as Flawless, since it's easier for a new magus to downgrade than to upgrade.
Size: +1 (0)
Refinement: 0
General Quality +2
Upkeep: +2
Safety: 0
Warping: 0
Health: +2
Aesthetics:: +2
Specialtizations: +2 Vis Extraction, +1 Cr, +1 Ig, +1 Te
Minor Virtue: Spacious (+2 Safety, +1 Aesthetics)
Free Virtues: Flawless Equipment (+2 General Quality, +2 Upkeep, +2 Vis Extraction), Flawless Tools (+1 Upkeep, +2 Items), Magical Heating (-1 Upkeep, +1 Health, +1 Aesthetics, +1 Ig), Spotless (+1 Health, +1 Aesthetics, +1 Cr)
Minor Flaw: Awkward Shape (-2 Safety, -1 Aesthetics)
Scott
EDIT: I should probably add Subterranean as well. I'm trying to figure out if Viola's lab should have that, too (I PM'ed amul to see if I can get a better idea of the temple's layout), though I think she plans to add Magical Heating and Lighting in any case, which would make the underground location moot.