Apartment Sale Contract Dispute

To your query, some relevant case laws are:
*. Carlill v Carbolic Smoke Ball Company [*]
*. Harvey v Facey [*]
*. Felthouse v Bindley [*]
*. Dickinson v Dodds [*]
These cases illustrate the principles of offer, acceptance, and communication of acceptance, crucial to contract law. Please consult a legal professional for further understanding.

From a general legal standpoint, it's likely that Karen may not have a successful contractual claim against Lisa. As there was no explicit acceptance from Lisa to Karen's counteroffer, no contract was formed. However, local laws may have variations. It's advisable to seek advice from a local attorney.

Using the IRAC format, we could structure it as follows:
Issue: Does Karen have a valid contractual claim against Lisa?
Rule: An agreement becomes a contract when there's an offer, acceptance, and consideration.
Application: Karen made a counteroffer, but Lisa didn't respond. Thus, no contract was formed.
Conclusion: Likely, Karen doesn't have a valid claim as no contract was formed. However, local laws may vary, so consult a local attorney.

In relation to your situation, some relevant case laws are:
*. Carlill v Carbolic Smoke Ball Company [*]
*. Harvey v Facey [*]
*. Felthouse v Bindley [*]
*. Dickinson v Dodds [*]
These cases highlight the principles of offer, acceptance, and communication of acceptance in contract law. Please consult a legal professional for further understanding.