Maryland Tax - Property Section 14-817
(a)   (1)   (i)   The sale shall be held on the day and at the place stated in the notice by advertising.
(ii)   The sale shall be held in the county in which the land to be sold is located.
(iii)   If the sale cannot be completed on that day, the collector shall continue the sale as determined by the collector and announced to the bidders at the sale until all property included in the sale is sold.
(2)   All sales shall be at public auction to the person who makes the highest good faith accepted bid, in fee or leasehold, as the case may be.
(3)   (i)   The collector shall retain any common law or other authority normally granted to an auctioneer conducting a public auction and may refuse to accept bids that are not made in good faith.
(ii)   The collector may delegate this authority to an auctioneer.
(4)   The conduct of the sale shall be according to terms set by the collector, and published with a reasonable degree of specificity in the public notice of the tax sale, to ensure the orderly functioning of the public auction and the integrity of the tax sale process, including requirements that potential bidders:
(i)   establish their eligibility for bidding by presenting evidence of the legal existence of the bidding entity that is satisfactory to the collector;
(ii)   limit their representation at a tax sale to no more than a single agent per bidding entity; and
(iii)   refrain from any act, agreement, consent, or conspiracy to suppress, predetermine, rig, or fix the bidding at the sale.
(5)   (i)   If determined by the collector to be in the best public interest and included in the required public notice of the sale, the collector may solicit and accept bids from the highest bidder for any group of properties to be sold at the tax sale.
(ii)   1.   Upon the request of any individual or group, the collector may remove any individual property or properties from a group of properties to be sold at the tax sale.
2.   Upon the request of the property owner at least 15 days before the date of the tax sale, the collector shall remove any individual property or properties from a group of properties to be sold at the tax sale.
(iii)   The collector shall provide notice to the potential bidders of any alterations to a group of properties at the time the bidders become known.
(iv)   The collector may conduct the sale of a group of properties under this paragraph by a sealed bid process.
(v)   Except in Montgomery County, the collector shall establish a high-bid premium under subsection (b)(2) of this section for all properties to be sold:
1.   in groups; or
2.   by sealed bid process.
(b)   (1)   Except as provided in subsection (c) of this section, property may not be sold for a sum less than the total amount of all taxes on the property that are certified to the collector under § 14-810 of this subtitle, together with interest and penalties on the taxes and the expenses incurred in making the sale, and the lien for the taxes, interest, penalties, and expenses passes to the purchaser.
(2)   (i)   The collector may establish a high-bid premium to be applied to all properties to be sold at the tax sale.
(ii)   Except as provided in subparagraphs (iii) and (iv) of this paragraph, the high-bid premium shall be 20% of the amount by which the highest bid exceeds 40% of the property's full cash value.
(iii)   Except as provided in subparagraph (iv) of this paragraph, in Baltimore City and Prince George's County, the high-bid premium shall be 20% of the amount by which the highest bid exceeds the greater of:
1.   the lien amount; or
2.   40% of the property's full cash value.
(iv)   For property assessed under agricultural use assessment, the high-bid premium shall be 20% of the amount by which the highest bid exceeds the appropriate value determined by the collector.
(v)   In addition to the amounts payable under paragraph (1) of this subsection, the highest bidder shall pay a high-bid premium if the collector:
1.   determines that a high-bid premium shall be used for the tax sale; and
2.   indicates in the public notice of the sale that the high-bid premium will be applied.
(vi)   The collector shall refund the high-bid premium, without interest, to:
1.   the holder of the tax sale certificate on redemption of the property for which the high-bid premium was paid; or
2.   the plaintiff in an action to foreclose the right of redemption on delivery of a tax sale deed for the property for which the high-bid premium was paid.
(vii)   The high-bid premium is not refundable after the time required under § 14-833 of this subtitle for an action to foreclose the right of redemption if there has been no redemption and if an action to foreclose the right of redemption has not been filed within that time.
(c)   (1)   In Baltimore City, abandoned property consisting of either a vacant lot or improved property cited as vacant and unfit for habitation on a housing or building violation notice may be sold for a sum less than the total amount of:
(i)   all taxes on the property that are certified to the collector under § 14-810 of this subtitle;
(ii)   interest and penalties on the taxes; and
(iii)   expenses incurred in making the sale.
(2)   The collector shall establish a minimum bid for abandoned property sold under this subsection.
(3)   The person responsible for the taxes prior to the sale shall remain liable to the collector for the difference between the amount received in the tax sale under this section and the taxes, interest, penalties, and expenses remaining after the sale.
(4)   The balance remaining after the tax sale shall be included in the amount necessary to redeem the property under § 14-828 of this subtitle.
(5)   In a proceeding brought by the Mayor and City Council of Baltimore City to foreclose the right of redemption under this subtitle, the complaint may request a judgment for the city in the amount of the balance.
(6)   The balance remaining after the tax sale is no longer a lien on the property when:
(i)   a judgment is entered foreclosing the owner's right of redemption;
(ii)   the deed is recorded; and
(iii)   all liens accruing subsequent to the date of sale are paid in full.
(7)   The Mayor and City Council may institute a separate action to collect the balance at any time within 7 years after the tax sale if the plaintiff is a private purchaser.