Improve logo, increase resolution

Kindly see my draft of the logo. I would like it to look more professional, the check mark to have higher contrast to the building, the building may be drawn differently but kept simple, and the font may still be adopted. It will have to be included on large printouts, the logo itself will measure up to 50cm in height.
Background: it is meant to be a simple logo for a Covid test facility in online and print publicity.